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• Have two exchange servers to communicate together

  - by Data-Base

  We have Exchange Server 2007 using our domain ddd.com. We created an isolated network with a firewall/gateway and installed a DC and Exchange Server 2010 using a demo/test domain (ddd.loc). We opened all the needed ports in the firewall (10.10.2.88) to the Exchange Server 2010. In our main Domain Controller (10.10.2.3) we defined the domain ddd.loc with IP 10.10.2.88 (firewalls). We also we defined MX records to the same IP (10.10.2.88) We did that so when we send email from my email [email protected] it will go to the Exchange Server 2010. Anyways, all the pings test from to any servers are OK. But we are not able to send or receive emails. Between these Exchange Servers we can not send any email from the 2010 to any email in general (emails are pending). Also, in Exchange 2007 we are getting error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

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• Exchange-Server Query

  - by Rudi Kershaw

  First, a little background. I've recently been taken on as a web and software developer for a small company, who has no other in-house IT support. They've been asking my opinion on lots of IT subjects that are quite far out of my comfort zone. I'm definitely not a network admin. Their IT consultancy contractor is pushing them to upgrade their dedicated exchange server, even though it seems like the one they currently have has a lot of life left in it and is running problem free. They say it's "coming to the natural end of it's life". They want to install a monster with a Xeon E5-2420, 32GB RAM, 2x 1TB HDDs, Windows Server 2012 and Microsoft Exchange 2010. They want to charge a small fortune for it. Basically, this system seems massively over the top seeing as it won't be doing anything else other than running as an exchange server for a company with less than 25 email accounts. My employers also have a file server system in-house that hosts three web apps, an SQL server, their local domain, print server and shared folders. That machine is using the same specs as the proposed new one, and it is barely using any of it's potential. I asked if Microsoft Exchange 2010 could be installed on their file server, but they said that MS Exchange can't run on the same system as an SQL server because for some reason they will eat up each others resources (even though the SQL server isn't touching 1% of the current system's CPU or RAM). My question is really, are they trying to rip my employers off? Could MS Exchange be installed on their other server (on a virtual instance or not), or does the old one even need replacing at all? Going with their current suggestion will cost the company in excess of £6k, and it seems entirely unnecessary. I apologies, because I know this is probably a little thin on details, but if I carry on I could end up writing a massive essay that no-one will want to read. I've been doing my research, but I'm not knowledgeable enough make any hard decisions. Let me know if you need any more details. Thank you for any help you can offer. Further Details: The new exchange would need to support Outlook Web App, 25 users, a few public mailboxes, and email exchange with Blackberries.

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• Office 365 E3 with Exchange Hosted Encryption (EHE)

  - by Stephen

  I hope this is the right forum for posting this question. I have a client who wants to move to Office 365. They are currently running on a trial of Office 365 E3 plan. My staff are now also using Office 365 E3 via the internal use licences provided as part of the MS Cloud Partner benefits. We've search high and low, spoken to about 15 different people at Office 365 Support, as well as my local distributor's MS Product Manager, but we cannot seem to find out exactly how to purchase/subscribe to the Exchange Hosted Encryption (EHE) service, or how to configure/use it from Office 365. Does anybody out there have any insight into how we can setup and use the EHE service? Thanks! Stephen

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• Single-Signon options for Exchange 2010

  - by freiheit

  We're working on a project to migrate employee email from Unix/open-source (courier IMAP, exim, squirrelmail, etc) to Exchange 2010, and trying to figure out options for single-signon for Outlook Web Access. So far all the options I've found are very ugly and "unsupportable", and may simply not work with Forefront. We already have JA-SIG CAS for token-based single-signon and Shibboleth for SAML. Users are directed to a simple in-house portal (a Perl CGI, really) that they use to sign in to most stuff. We have an HA OpenLDAP cluster that's already synchronized against another AD domain and will be synchronized with the AD domain Exchange will be using. CAS authenticates against LDAP. The portal authenticates against CAS. Shibboleth authenticates with CAS but pulls additional data from LDAP. We're moving in the direction of having web services authenticate against CAS or Shibboleth. (Students are already on SAML/Shibboleth authenticated Google Apps for Education) With Squirrelmail we have a horrible hack linked to from that portal page that authenticates against CAS, gets your original plaintext password (yes, I know, evil), and gives you an HTTP form pre-filled with all the necessary squirrelmail login details with javaScript onLoad stuff to immediately submit the form. Trying to find out exactly what is possible with Exchange/OWA seems to be difficult. "CAS" is both the acronym for our single-signon server and an Exchange component. From what I've been able to tell there's an addon for Exchange that does SAML, but only for federating things like free/busy calendar info, not authenticating users. Plus it costs additional money so there's no way to experiment with it to see if it can be coaxed into doing what we want. Our plans for the Exchange cluster involve Forefront Threat Management Gateway (the new ISA) in the DMZ front-ending the CAS servers. So, the real question: Has anybody managed to make Exchange authenticate with CAS (token-based single-signon) or SAML, or with something I can reasonably likely make authenticate with one of those (such as anything that will accept apache's authentication)? With Forefront? Failing that, anybody have some tips on convincing OWA Forms Based Authentication (FBA) into letting us somehow "pre-login" the user? (log in as them and pass back cookies to the user, or giving the user a pre-filled form that autosubmits like we do with squirrelmail). This is the least-favorite option for a number of reasons, but it would (just barely) satisfy our requirements. From what I hear from the guy implementing Forefront, we may have to set OWA to basic authentication and do forms in Forefront for authentication, so it's possible this isn't even possible. I did find CasOwa, but it only mentions Exchange 2007, looks kinda scary, and as near as I can tell is mostly the same OWA FBA hack I was considering slightly more integrated with the CAS server. It also didn't look like many people had had much success with it. And it may not work with Forefront. There's also "CASifying Outlook Web Access 2", but that one scares me, too, and involves setting up a complex proxy config, which seems more likely to break. And, again, doesn't look like it would work with Forefront. Am I missing something with Exchange SAML (OWA Federated whatchamacallit) where it is possible to configure to do user authentication and not just free/busy access authorization?

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• authenticating to exchange 2010 smarthost?

  - by Richard Hansen

  I have a postfix mail server that should relay all outgoing mail to an Exchange 2010 server (the Exchange box is my smarthost). I have administrator access to the Exchange 2010 system, but I'm not very familiar with it. How should I set up authentication on the Exchange 2010 system? I guess I could add a standard user with a mailbox on the Exchange box, then configure my postfix box to log in to port 587 to relay mail. That option doesn't feel right -- it seems like there should be way to do server to server authentication, not just client to server authentication. Is there? If so, how would I set it up?

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• Configuring DNS & MX records for exchange 2010

  - by Mahmoud Saleh

  i am trying to configure Exchange Server 2010 on Windows Server 2008 R2 to receive emails from the internet following the danscourses tutorials: and i followed this video for the DNS & MX records: http://www.youtube.com/watch?v=jdf_3DRssks i don't have any windows administration skills, and i am stuck with the DNS configuration. and the following are my domain configuration i got from the hosting. following are the steps i made: 1- Add new name server: add ns1.centors.com ip Exchange Server Public IP: 41.233.26.131 2- Change the A record change it to point to the public ip address Exchange Server Public IP: 41.233.26.131 3- New cname record for www and make it resolve to centors.com 4- New mx record for mail.centors.com 5- New A record for mail.centors.com: name: mail ip: Exchange Server Public IP: 41.233.26.131 6- new A record for ns1: ip: Exchange Server Public IP: 41.233.26.131 7- i made port forward in the router for SMTP and POP3 to the exchange server local ip address. ISSUE: i have a user account in the active directory, and the user is member of the domain, the user is [email protected] and when trying to login with this account in outlook 2010 on other machine using following data: account type: POP3 incoming mail server: mail.centors.com outgoing mail server: mail.centors.com i always get the error: Authorization failed, check your server settings. please advise what's wrong with the configuration, thanks in advance.

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• Calendar booking issue - Exchange 2003 and 2010

  - by NaOH

  In our organization we are running Exchange 2003 and 2010 simultaneously, with the hopes of migrating everyone to Exchange 2010 sometime within the next few months. Everyone is using Outlook 2010. Recently, we had an issue with transaction log storage on the Exchange 2003 server. This was resolved, but for some reason no meeting rooms on the Exchange 2003 server will automatically book meetings any longer. I have played around with this for a while, changing calendar permissions, turning resource scheduling off and back on, etc. No dice. My next step was to try migrating a resource to the Exchange 2010 server. After doing so, and setting it up as a Room, enabling Auto-Accept and removing the EnableDirectBooking registry entry on my PC, I can book a meeting with this room. If EnableDirectBooking is enabled, I get an error message stating: "Meeting Room" declined your meeting because it is recurring. You must book each meeting separately with this resource. This is despite the fact that the meeting I'm attempting to create has no recurrence. Now, I have also created a new test Room from scratch on the Exchange 2010 server, and I can book a meeting with this Room regardless of whether or not I have the EnableDirectBooking reg entry in place. All users here have this registry entry, and I'd rather not have to figure out how to push something out to remove it from every PC. Rather, I'd like to figure out what's different between the configurations of these two meeting rooms so that I could book a meeting room regardless of whether EnableDirectBooking is enabled or not. Any ideas, anyone? Thanks!

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• Exchange 2003: recover mailbox when migrated to 2007

  - by lyngsie

  We have migrated almost all of our mailboxes from Exchange 2003 to 2007 so both are still up and co-existing in our domain. One mailbox is missing some mails, and I tried to recover from an Exchange 2003 backup using ExMerge as usual, but it throws an error: Error opening message store (MSEMS). Verify that the Microsoft Exchange Information Store service is running and that you have the correct permissions to log on. (0x8004011d) This should be normal when a mailbox has been migrated to 2007 and you try to recover a 2003 backup as stated here: http://www.petri.co.il/restoring-exchange-2003-mailboxes-exchange-2007-exmerge.htm We then tried the solution given in the article (copying the value "homemdb" for the user and pasting this in "msExchOrigMDB" for the Recovery Storage Group object in adsiedit). The error unfortuntely persists. So my question is, how can I extract a .pst from a mailbox in the recovery storage group when both Exchange 2003 and 2007 are running? I assume this is why the solution in the article didn't work. If no solution is possible using regular tools (exmerge, eseutil, etc.) which third-party tool should we choose - preferably the cheapest as we only need this one mailbox recovered.

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• How to extract attachments from Exchange 2003 database

  - by John

  I have an ancient Exchange 2003 server that I'm getting ready to retire. All user accounts have been migrated to Google Apps for Business, so no new mail is being sent or received on the server. There are less than 50 accounts on the server, but some are very large so that the whole Exchange database is between 10 and 20 GB. The largest account has over 100,000 messages. I believe that in the migration to Gmail, some attachments were not migrated. For peace of mind, I'd like to get the attachments out of the Exchange database. The only way I know of to do this is to set up a 2nd computer with Outlook on it, set up one of the accounts, and then sync the whole mail history and get the attachments out that way. Is there something simpler that I can do? Here are two possibilities: An Exchange attachment retrieval tool/script that pulls attachments for all accounts directly out of the Exchange database. An Exchange PST exporter tool/script that will export PST files for all accounts so that I can just load the PST files into Outlook at will.

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• Exchange 2007 and migrating only some users under a shared domain name

  - by DomoDomo

  I'm in the process of moving two law firms to hosted Exchange 2007, a service that the consulting company I work for offers. Let's call these two firms Crane Law and Poole Law. These two firms were ONE firm just six months ago, but split. So they have three email domains: Old Firm: craneandpoole.com New Firm 1: cranelaw.com New Firm 2: poolelaw.com Both Firm 1 & Firm 2 use craneandpoole.com email addresses, as for the other two domains, only people who work at the respective firm use that firm's domain name, natch. Currently these two firms are still using the same pre-split internal Exchange 2007 server, where MX records for all three domains point. Here's the problem. I'm not moving both companies at the same time. I'm moving Crane Law two weeks before Poole Law. During this two weeks, both companies need to be able to: Continue to receive emails addressed to craneandpoole.com Send emails between firms, using cranelaw.com and poolelaw.com accounts I also have a third problem: I'd like to setup all three domains in my hosting infrastructure way ahead of time, to make my own life easier What would solve all my problems would be, if there is some way I can tell Exchange 2007, even though this domain exists locally forward on the message to the outside world using public MX record as a basis for where to send it (or if I could somehow create a route for it statically that would work too). If this doesn't work, to address points #1 when I migrate Crane Law, I will delete all references locally to cranelaw.com on their current Exchange server, and setup individual forwards for each of their craneandpool.com mailboxes to forward to our hosted exchange server. This will also take care of point #2, since the cranelaw.com won't be there locally, when poolelaw.com tries to send to cranelaw.com, public MX records will be used for mail routing decisions and go to my hosted exchange. The bummer of that though is, I won't be able to setup poolelaw.com ahead of time in hosted Exchange, will have to wait to do it day of :( Sorry for the long and confusing post. Just wondering if there is a better or simpler way to do what I want? Three tier forests and that kind of thing are out, this is just a two week window where they won't be in the same place.

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• Exchange 2007 two node cluster setup on Windows 2008 Enterprise, install error

  - by Shadow00Caster

  I am installing Microsoft Exchange 2007 x64 in a two node environment using Microsoft Windows 2008 Enterprise x64. The Failover Cluster is all setup properly and following best practices for setting up the windows clustering for use with Exchange 2007. All the validation tests pass on the cluster and all of that portion is working fine. The problem is when I go to install the first Exchange node as an Active mailbox in configuration for a two node CCR. It gets all the way through the first 3 steps (Copy Exchange Files, Management Tools, Mailbox Role) and then fails on the 4th step 'Clustered Mailbox Server' with the following error: Error: The clustered mailbox server's group 'XXXX' was not found, and should already exist. Firewalls are all disabled, DNS is all setup properly, the environment has 3 domain controllers all 2k8 ent x64, all replication works. The name I pick for the CCR cluster (XXX) does not exist in AD or in DNS. I have attempted this install from both of the two Exchange nodes and multiple times .. tried with different names. I have been banging my head against the wall for days working on this and would appreciate any feedback on the issue.

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• Trying To Uninstall Exchange 2007 From Server - Stuck On "Mailbox Role Checks"

  - by Matthew Hodgkins

  Hi All, I am trying to uninstall Exchange 2007 on a secodary server which has been decommissioned for quite a while (cleaning up after an old Network Admin). The only roll the server had was "Mailbox Role" (the primary server also has this). I have tried uninstalling using Programs and Features GUI tool but that hung on Mailbox Role Checks. I then tried uninstalling Exchange by running Setup.com /mode:uninstall. It has been stuck on 1% of "Mailbox Role Checks" for over 3 hours now. Is there any other options I have for uninstalling Exchange 2007 so the old server can be removed from the Exchange Management console?

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• Change which server mailbox is associated with in Exchange 2007

  - by tacos_tacos_tacos

  I have restored and mounted an EDB file onto a new Exchange 2007 Server. However, the old server is still online and although all the mailboxes I need are in the newly-mounted database, in Exchange 2007 System Manager it still shows that the mailbox is associated with the old server. If I try to "Move" the database it actually tries to copy the files from the old server to the new server, which is not necessary because they are already there - and produces and error about the mailbox on the destination already existing. How can I simply tell Exchange (AD?) to use the new server to find the mailbox rather than the old? Edit: I did the restore by taking the old server offline (turning off all Exchange services), copying EDB file to the new server, restoring it with eseutil, and mounting it to the new server. I did it this way in part because I didn't know a better way and in part because I couldn't use move-mailbox as the source location had a horrible Internet connection (which is why Exchange is being moved to the new location). I had to copy the EDB from the old server to a hard disk, go somewhere with a better Internet connection, upload the EDB to the new server.

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• Lync Edge and Exchange Server: how to have access to my exchange mailbox from external network and also to the OWA

  - by Garcia Julien

  I've some problem in the configuration of Exchange 2010. My topology is like that: Server1 = Domain Controller Server2 = Exchange Server Server3 = Lync Server Server4 = Lync Edge Our public address (the one accessible by outside world) is directed to Server4. I would like to have access to my exchange mailbox from external network and also to the OWA. Could you help me in the configuration of thoses servers? Thank in advance Julien

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• Exchange 2013 Internal Relay via Smart Host

  - by Matt Clements

  Thank you for your help in advance! I am currently setting up an Exchange 2013 server, to replace our old POP3/SMTP system, however we would like to roll this out gradually when convenient for our staff. Our plan is therefore: Setup Exchange 2013 to retrieve email via POP Connector - Done Setup Exchange 2013 to send ALL mail via a SmartHost - Issues I have set the domains in Mail Flow Accepted Domains to Internal Relay, enabled a Smart Host for * as the domain name, and disabled/deleted the accounts that are not setup yet; however Exchange just bounces the emails with no errors.

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• Unable to communicate with EWS from Exchange Server

  - by kschieck

  We are currently running a 2 server exchange environment with Edge services on their own. We are in the process of trying to deploy a piece of software that uses the EWS API which has brought me to this form, the software ties into the EWS service and uses it to forward messages (this is failing). Using the software error logs I have found that accessing EWS from the exchange server is not possible. From my work machine and an external address I can type the following https ://webmail.companyname.com/ews/exchange.asmx and be prompted for a username and password, once I enter credentials I get a screen full of information from services.wsdl. The problem is when I try the same URL from the exchange server and get the credentials prompt I cannot get past it. Even with the same credentials that work externally and from my desk it just keeps looping around. Capture from software log (11:41:32.6415 000017e4 System.Net.WebException: The request failed with HTTP status 401: Unauthorized.) I have also found the same results when trying https://webmail.companyname.com/ Autodiscover /Autodiscover.xml . Environment Information Server 2008 STD 64bit Exchange 2007 SP1 Purchased Cert – webmail.companyname.com I have also confirmed that all services have the proper internal and external URL’s. Any help would be appreciated.

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• Migrated from Exchange 2003 to Exchange 2007 - remove old 03 computer account?

  - by TheCleaner

  Migrated from Exchange 2003 to 2007 back in February of this year. I've still got the old exchange computer account in AD. Can I simply delete the computer account or will bad things start happening? I've looked in the Exchange 07 console and don't see the old server listed at all. HOWEVER: we do still have an old CNAME for this old Exchange server pointing to the new one for a few old clients that still have their mail server set to the old name...if that matters at all. I ran "get-exchangeserver" on the new server and the old one isn't listed at all.

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• Cannot click send button in Outlook (+ Exchange) for unknown addresses

  - by Graphain

  Hi, I have a very unusual problem. I have Outlook 2010 connected to Exchange 2010. This can send emails perfectly to known addresses (that is, addresses in the address book or ones that have been sent to previously). However, if I put in an address that is unknown, I cannot actually click the Send button in Outlook. (it simply does nothing). Corresponding to this I get errors in the Event Log for each Send click stating "The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.". However, Outlook shows as connected the whole time, pings do not break, and I have no reason to suspect it has lost connection. To further complicate matters, Outlook is fine on all other PCs, and this was all perfect until I installed BitDefender on the PC in question and the Exchange Server. Outlook was still fine on these other PCs while BitDefender was installed, but I have removed it from the PC in question and the Server just in case (no success). Summary: Outlook encounters Exchange connectivity issues when sending to unknown (new) email addresses that prevent the Send button actually working at all. This is isolated to one machine and occurred after installation of AV/Firewall software which has since been thoroughly removed. If you have any potential solutions I'd love to hear them, as I will be resorting to reformatting the PC in question, and probably removing Exchange because I'm sick of its issues if I cannot resolve this soon. Big thanks for any help.

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• Restore single users Exchange 2003 mailbox from backup

  - by Campo

  I take weekly backups of exchange in full. I also take complete weekly backups of the entire server. It is a Server 2003 R2 with AD and Exchange 2003 all on one box. One users inbox has disappeared. She has 19000+ junk items now. It is possible the inbox got mixed into the junk. Regardless it is such a huge mess she is not going to go through all of that.... I want to restore he mailbox from the backup. I followed this MS KB http://support.microsoft.com/kb/823176 I had to use Method 3. I have a VM of Server 2003 R2 with exchange but I am having failures on the restore from NT backup. The backup log just states to check the application log.... Application log points to backup log... Only info Is failed to restore Only thing different is the computer name... The only error I can find is in the Application log. Information Store Database not found All others just say that the backup failed. Any assistance is greatly appreciated. UPDATE I have successfully proven I can restore the DB into a recovery storage group in my VM Unfortunately due to the actual account being on a different store I am unable to do the recovery... Error is The attempt to log on to the Microsoft Exchange Server computer has failed. The MAPI provider failed. Microsoft Exchange Server Information Store ID no: 8004011d-0512-00000000 Two questions QUESTION 1 Should I repeat my steps on the production exchange server in the recover storage group? then merge into her original account? I am just concerned with doing recovery like that on the live server.... QUESTION 2 Is there any way I can extract her .PST from my recovery VM and then import into her outlook? On the Recovery VM: I restored the raw DB from my full backup repaired it with ESEUTIL then mounted in the recovery store. Was thinking I could just repeat and mount in the main store on the VM? Thanks for the suggestions.

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• Exchange MSExchangeIS Mailbox Store Error

  - by Bart Silverstrim

  Boss asked me to check to see if I could figure out why he's had to restart the services on the Exchange server three mornings in a row now. While going through the system logs I ran across an error from the MSExchangeIs Mailbox Store, category General, Event 9690. The message said (edited to make generalized): Exchange store 'First Storage Group\Mailbox Store (Servername)': The logical size of this database (the logical size equals the physical size of the .edb file and the .stm file minus the logical free space in each) is 22GB. This database size has exceeded the size limit of 22 GB. This database will be dismounted immediately. Hmm...happened at five in the morning, and I'm thinking this is a pretty good hint that this leads to the culprit. Thing is I'm not an Exchange expert, so I'm still googling around to figure out how to fix the problem. Any better guidance out there? Or am I barking up the wrong binary tree? Exchange System Manager reports that the server is "version 6.5 build 7638.2, SP2", standard, which I believe is Exchange 2003. It's running on Windows Server 2003 R2 Standard, SP2.

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• Recommendations for handling Directory Harvesting spam on Exchange 2003

  - by Aaron Alton

  Our Exchange server is getting slammed with anywhere between 450,000 and 700,000 spam messages per day. We receive about 1700 legitimate messages in the same time frame. Roughly 75% of the spam is directory harvesting. We currently have GFI MailEssentials installed. To it's credit, it's doing a very good job, but the sheer volume of spam that we're receiving, and the number of connections that our exchange server is making is preventing legitimate email from being delivered in a timely manner. GFI is set up to check for directory harvesting at the SMTP level, which I presume intercepts the mail before it hits the Exchange services , or goes through SMSE. This "module" is ordered at the top of the list, so (hopefully) dealing with the harvesting is consuming a minimum amount of server resources and bandwidth. My question is, is there anything I can do to prevent our Exchange server's connection pool from being eaten up by these spam hosts? We had to limit the number of concurrent connections being made by Exchange, because it was consuming all of our bandwidth. Thanks, in advance.

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• Cluster Core Resource state of Exchange 2010 DAG

  - by Christoph

  I have two Exchange 2010 servers in a DAG and a witness server to implement mailbox resiliency. The two Exchange servers are in two subnets and the Windows failover cluster therefore has two IP address resources. I now that Exchange uses "core functionality" of Windows Server failover clustering, but it does not use all features. My setup also seems to work, but if I run the validation in the Windows Failover Cluster Manager, it complains about one of the IP address resources being offline. However, I cannot bring this resource online, because the server complains that "the specified cluster node is not the owner of the resource, or the node is not a possible owner of the resource". If I "Simulate failure of this resource", it becomes offline and the other IP becomes online. I have the vague idea that Exchange might use the state of the IP resource to identify the Primary Active Manager, but I am not sure. As it is obviously important that failover really works, I would like to be sure. Therefore, my question is: Is it normal that only one IP address resource in a Exchange 2010 DAG failover cluster is active at a time? If not, how do I bring both resources online at the same time given the error described above?

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• Forwarding all received mail to another server in Exchange 2007

  - by Moo

  Hi, We are moving away from our Exchange environment on a hosted server to one managed in-house, and I was wondering how to have the hosted Exchange forward all email received to the new server - the servers are not on the same network, and both have the same users setup. Basically, I just need the hosted Exchange to act as a dumb relay - accept the mail, send it straight on to our new server without trying to deliver locally. Is this possible? Regards Moo

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• Intermittent 5.7.1 email bounce to Exchange 2007

  - by Steve Kennaird

  My knowledge of Exchange isn't particularly great, so excuse me if some of the terminology I use isn't quite right. I'm primarily a web developer who's now responsible for a small business's network. We have a server running SBS 2008 and Exchange 2007. Generally, everything works well, emails are able to be sent to both internal and external domains without issue. We've only got ~20 users, Exchange is sitting on a single server. I use SendGrid to send emails generated by our externally hosted website to users in the office. Primarily, order notifications are sent to [email protected]. Without any pattern and less than once per week on average, an email to [email protected] will bounce back, and the logs on SendGrid detail the following error: 550 5.7.1 Unable to relay for [email protected] Either side of that failed delivery attempt, I'm able to send and receive emails to/from [email protected]. Having done some research, incorrect reverse DNS seems like it could be a cause of intermittent bounces like this. Having used nslookup, I have found that the reverse DNS doesn't map like it should, e.g. Office IP: 135.325.351.123 (made up IP, for example only) Domain: office.somedomain.com (made up, for example only) Reverse DNS: somedomain.gotadsl.co.uk (half made up) Could this be a cause? I'm sure that the IP address and the domain should map to each other. Also, it has been suggested to me that as the Exchange server is on a network with an ADSL connection, that could be a potential cause as the connection "goes up and down all day long". I don't have an opinion on this, as I don't have enough knowledge of Exchange/ADSL to form a reliable opinion. Can anyone offer any insight as to whether one or both are actually potential causes, or if there is another possible cause?

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• Exchange 2010 install locks out high level accounts

  - by tearman

  Basically, when we installed Exchange 2010 alongside our Exchange 2003 server (we assume), this is what caused our problem. The Exchange 2010 server is not active, just running on the domain. What's actually going on is that user groups like Enterprise Admins are getting a single deny flag on Full Control over mailboxes currently residing on the Exchange 2003 server which is preventing any of us from making changes. It says these permissions are inherited from the Parent Object, but we have no idea which one that is. Any idea on how to go about fixing this?

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