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  • Cannot connect to remote mail server for sending emails in ASP.NET

    - by Dave
    I want to migrate a web application from a Windows Server 2003 to a Windows Server 2008 R2. All works fine except sending emails from the application. If I configure the application to use the smtp server on "localhost" it works, but changing it to the "real" host name (e.g. mail.example.org) no mail is sent. The error message says, that the remote server needs a secure connection or smtp authentication. But since it works when using "localhost" instead of the host name I doubt that this is the problem. Also it's unlikely a problem with the mail server, I also tried it with another one. So for me it seems like the firewall is blocking the outgoing connection to the mail server. I tried to open port 25, but it still did not work. Maybe I just did it the wrong way. Update: For clarifying my setup: I have a Windows Server 2008 R2 with hMailServer installed (set up for some of the hosted domains) For the website I'm talking about I need to use an external mail server (totally different hosting provider) Apparently I was a bit off the track. It seems like it works when using connecting to the local mail server either with the host name "localhost" or "mail.somedomain.com" (while somedomain.com is set up in my mail server). But when using the host name of the external mail server ("mail.externaldomain.com") it seems like it tries to connect to the local server again, although this domain is not set up in the mail server. Thanks to Evan Anderson for the tip to use telnet - why I have not thought of it myself?... :-) Note, the website www.externaldomain.com is hosted on my server but the DNS entries are maintained by the other hosting provider. "externaldomain.com" is the only entry which points to my server all other records (MX, subdomains) are pointing to the other server. So I think the question is now, how do i bring my server to connect to the external mailserver. Do I have to configure this in my mail server or is it a windows server thing?

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  • PTR record not valid for all domains

    - by charnley
    We have an issue sending emails to certain domains, namely Time Warner and Cox. Last week, we decommissioned our Exchange 2003 server and now our Exchange 2010 server is doing all of the transport for our domain. We run our own authoritative name servers, so we are in charge of the DNS and have modified our PTR record to reflect the new server. All mailflow is working except for these 2 domains. When I telnet on port 25 to the mail servers for Cox and Time Warner I am receiving errors. For Cox the error is: 554... rejected - no rDNS And when I telnet to port 25 to the Time Warner mail server we get this: 554 5.7.1 - Connection refused. IP name lookup failed for x.x.x.x I have run through the outbound SMTP test on Microsoft Remote Connectivity Analyzer and get 100% completely successful results. MXToolbox comes up with all successful tests on SMTP as well, showing correct reverse banner check, and no blacklisting. DNSQueries.com shows a valid reverse DNS entry as well for us. Outbound emails to these 2 domains continue to sit in the queue. Any ideas or advice would be greatly appreciated. Thanks!

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  • How to unblacklist an IP at Google?

    - by DJRayon
    I own a small business with two servers for webhosting. When setting up the primary (CentOS 5.5 + WHM, secondary is WHM DNS Only) server I kinda messed up the firewall, so the hackers could send stuff from my server. My primary IP is x.y.29.218. Anyway - I got blacklisted in several places, but now those blacklistings are gone. For a week or so, but Google still has my IP blacklisted. I handling serious damages because of that. Many clients want to switch from my hosting, etc. I've fixed the hole with CSF firewall SMTP_BLOCK option and enabled also the WHM SMTP TEAK Currently all I see from the Main Email View Mail Statistics (Errors section) in WHM is rows and rows of the following message removed-the-email-address-for-security R=lookuphost T=remote_smtp: SMTP error from remote mail server after end of data: host aspmx.l.google.com [a.b.39.27]: 550-5.7.1 [x.y.29.218 1] Our system has detected an unusual rate of\n550-5.7.1 unsolicited mail originating from your IP address. To protect our\n550-5.7.1 users from spam, mail sent from your IP address has been blocked.\n550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review\n550 5.7.1 our Bulk Email Senders Guidelines. h24si3868764fas.171 What are my options? I have one IP free. How can I configure Exim to send mail from that IP? My brain is like constantly blowing up because of this problem. Please someone, who has any knowledge how to deal with the current situation, please give me some kind of help - any help, suggestions, etc. I've tried everything I know, and I still don't know much, because this is the first time (I just started to webhost, etc) I deal with real physical servers not some kind of pre-setup VPS solution. Many - many thanks, whoever has time to offer some help.

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  • SharePoint, Exchange and Incoming Emails Without Directory Management Services

    - by Nariman
    Trying to keep this as simple as possible. We've already created the email accounts that we need (e.g. account[1-20]@domain.com) on Exchange/AD. We'd like to now enable incoming emails on SharePoint 2007 lists corresponding to these accounts. My thinking is we don’t need to configure Directory Management Services [2] – the architecture will be simpler without it and the application doesn’t require these services. However, we still need to route messages from Exchange to either local SMTP services (via the connector described in the articles below) or by user-specific drop-folder settings (if permitted by Exchange). So the question is: can we instruct Exchange to use a drop folder just for accounts account[1-20]@domain.com? or do we need to change the accounts to account[1-20]@sharepointsmtp.domain.com and re-route those message to the local SMTP service that will drop them on disk? I've read the material below. [1] - http://www.combined-knowledge.com/Downloads/2007/How%20to%20configure%20Email%20Enabled%20Lists%20in%20Moss2007%20RTM%20using%20Exchange%202007.pdf http://social.msdn.microsoft.com/Forums/en/sharepointdevelopment/thread/91e0c3d2-afe6-469d-b1bc-6ae7a9aa287e http://gj80blogtech.blogspot.com/2009/12/configure-incoming-email-setting-in.html http://www.jasonslater.co.uk/2007/08/10/configuring-incoming-mail-on-moss-2007-and-exchange-2007/ http://technet.microsoft.com/en-us/library/cc262947%28office.12%29.aspx http://technet.microsoft.com/en-us/library/cc263260%28office.12%29.aspx [2] – http://graycloud.com/sharepoint/incoming-mail-configuration-what-permissions-are-require-t39483.html

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  • Message to distribution list with removed recipient bouncing back when sent from external mail server

    - by jshin47
    I removed a particular user from all distribution groups manually about five days ago. This user was a member of two particular groups that have other recipients. The OAB polling interval is 30 minutes, not that it really matters here. The situation is that I have an SMTP server that is not part of my Exchange organization that sends out automated email reports to these distribution groups. It sends them using a from: address that is a member of our Exchange organization. That member receives a bounce-back email indicating the member that should have been removed from the group does not exist. I have also verified that this is the same behavior when sending an email from a webmail service like GMail or Hotmail (outside of our Exchange organization of course) to either of those distribution group addresses. However when I send an email internally to one of those distribution group addresses everything works as expected (no bounce messages.) Not sure why this would be happening, but also not sure how to go about diagnosing the issue. I've looked at the SMTP headers and there are no relevant clues there as far as I can tell. I think it's an Exchange issue.

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  • Email Proxy Ideas

    - by jtnire
    Hi Everyone, I wish to host some managed email servers for some customers. Each customer will have their own email server which will be an all-in-one virtual machine running postfix, dovecot and some webmail suite. Even though each customer will have their own server, I do not wish to give each email server it's own public facing IP. I wish to avail the use of proxy servers so all customers use the same public IP. As for the "smtp-in" from the public internet, this isn't a problem as I can set up many mx servers (using postfix) which will store-and-forward the mail to the correct server (using transport maps). As for the IMAP access from the customer, I was thinking of using perdition which is an IMAP proxy - I believe that this will suit my needs. I am confused however on what to use for the "smtp-out" proxy. The customers will have to authenticate with their receptive email server, however they will have to go via a proxy of some sort as they won't have direct access to their server instance. It probably can't be a store-and-forward proxy either. Does anyone have any idea on what I could use here? Many Thanks

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  • Exim - send certain "local" user mail to smtp

    - by Ryan Anderson
    I'm using Exim 3 and would like to know how to send some local addresses to the smtp server instead of Exim handling them as a localuser. They are local addresses in the sense that they have the same domain as listed in 'local_domains' in exim.conf. I tried using the "require_files" option on the localuser director in exim.conf, but with no luck. Any help appreciated. Thanks, Ryan

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  • Postfix smtp test occured "Relay access denied"

    - by liuxingruo
    I was following the tutorial http://wiki.centos.org/zh/HowTos/postfix_restrictions but, when I tried to send a mail with smtp, it returns: Connected to XXX.XXX.33.22 (XXX.XXX.33.22). Escape character is '^]'. 220 mail.xxxx.com ESMTP Postfix HELO mail.xxxx.com 250 mail.xxxx.com MAIL FROM:<[email protected]> 250 2.1.0 Ok RCPT TO:<[email protected]> 554 5.7.1 <[email protected]>: Relay access denied And, the postfix main.cf setting is relay_domains =

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  • Why won't vyatta allow SMTP through my firewall?

    - by Solignis
    I am setting up a vyatta router on VMware ESXi, But I see to have hit a major snag, I could not get my firewall and NAT to work correctly. I am not sure what was wrong with NAT but it "seems" to be working now. But the firewall is not allowing traffic from my WAN interface (eth0) to my LAN (eth1). I can confirm its the firewall because I disabled all firewall rules and everything worked with just NAT. If put the firewalls (WAN and LAN) back in place nothing can get through to port 25. I am not really sure what the issue could be I am using pretty basic firewall rules, I wrote the rules while looking at the vyatta docs so unless there is something odd with the documentation they "should" be working. Here is my NAT rules so far; vyatta@gateway# show service nat rule 20 { description "Zimbra SNAT #1" outbound-interface eth0 outside-address { address 74.XXX.XXX.XXX } source { address 10.0.0.17 } type source } rule 21 { description "Zimbra SMTP #1" destination { address 74.XXX.XXX.XXX port 25 } inbound-interface eth0 inside-address { address 10.0.0.17 } protocol tcp type destination } rule 100 { description "Default LAN -> WAN" outbound-interface eth0 outside-address { address 74.XXX.XXX.XXX } source { address 10.0.0.0/24 } type source } Then here is my firewall rules, this is where I believe the problem is. vyatta@gateway# show firewall all-ping enable broadcast-ping disable conntrack-expect-table-size 4096 conntrack-hash-size 4096 conntrack-table-size 32768 conntrack-tcp-loose enable ipv6-receive-redirects disable ipv6-src-route disable ip-src-route disable log-martians enable name LAN_in { rule 100 { action accept description "Default LAN -> any" protocol all source { address 10.0.0.0/24 } } } name LAN_out { } name LOCAL { rule 100 { action accept state { established enable } } } name WAN_in { rule 20 { action accept description "Allow SMTP connections to MX01" destination { address 74.XXX.XXX.XXX port 25 } protocol tcp } rule 100 { action accept description "Allow established connections back through" state { established enable } } } name WAN_out { } receive-redirects disable send-redirects enable source-validation disable syn-cookies enable SIDENOTE To test for open ports I have using this website, http://www.yougetsignal.com/tools/open-ports/, it showed port 25 as open without the firewall rules and closed with the firewall rules. UPDATE Just to see if the firewall was working properly I made a rule to block SSH from the WAN interface. When I checked for port 22 on my primary WAN address it said it was still open even though I outright blocked the port. Here is the rule I used; rule 21 { action reject destination { address 74.219.80.163 port 22 } protocol tcp } So now I am convinced either I am doing something wrong or the firewall is not working like it should.

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  • Sending emails to site subscribers

    - by Art
    I have a site where people enter their email address to be reminded of a weekly posting. I only send them the weekly email that they double-opt-in for. I do not sell, trade, expose, or do anything else with their address. Right now I have a bit of a hack, connecting to a large email providers SMTP server to send the emails. As the site grows I fear that my emails will be marked as spam and that I will be violating the TOS of the provider. I'm considering two options, building an in-house SMTP server or using a mailing list service. Is there a best-known-method for this? I'd really prefer to simply build my email and use a script to send them through the SMTP server rather then use some GUI to build the email and import a list of addresses. But previous experience tells me that running a mail server and not being marked as spam can be difficult. Help!?

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  • PHPMailer, fsockopen(), possible Apache issue?

    - by danp
    I'm using PHPMailer to send out site contacts. In development, the script works perfectly with the GMail service over smtp. However, in production, inside the client's DMZ, it appears unable to connect to the SMTP service they have there. I have connected to the same service using telnet to port 25, so I know for sure it exists and is available to the server. Are there any circumstances where php might not be able to open a socket connection (fsockopen)...? The php extension openssl is loaded and ok. The error is "Unable to connect to SMTP service". Thanks!

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  • setting up log4j for gmail, does not recognize System.setProperty("mail.smtps.port", "587")

    - by Alex Le
    Hi I am trying to setup a smtpappender for log4j using gmail as the smtp host. I have read that the port number needs to be 465 or 587 (depending on tls or ssl) and that log4j for some reason doesnt allow a different port to be set inside log4j.properties configuration file. I have read that the best way of doing this would be to use System.setProperty which would change the default javaxmail port to gmail. However when I try to set the System.property entries the the default port still remains as 25 System.setProperty("mail.smtp.starttls.enable", "true"); System.setProperty("mail.smtp.port", "587"); I was wondering if someone could help me out, I am open to suggestions, I just need to smtpAppender to work for gmail, dont really care how to get it to work. Thanks

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  • Java Mail timeout & connectiontimeout handling

    - by Gnanam
    Hi, I'm using JavaMail to send email requests to an SMTP server. I would like to set both "mail.smtp.connectiontimeout" and "mail.smtp.timeout" properties within my code. Programmatically, I want to catch both when timeout and/or connectiontimeout operations are reached in Java and handle things accordingly. Handling in the sense, I need to retry the same email once again the next time. How do I handle this in Java/JavaMail? Is it possible to catch & handle this timeout operations?

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  • Ruby Net::SMTP - Send email with bcc: recipients

    - by Jay Godse
    I would like to use Ruby Net::SMTP to send email. The routine send_message( msgstr, from_addr, *to_addrs ) works well in my code for sending email, but it is not clear from this API how to send email to a list of people that need to be blind copied (bcc:). Am I missing something, or is it just not possible with Net::SMTP?

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  • Email SMTP validator

    - by Hrvoje
    I need to send hundreds of newsletters, but would like to check first if email exists on server. It's called smtp validation, at least i think so, based on my research on net. There's several libraries that can do that, and also a page with open-source code in asp (http://www.coveryourasp.com/ValidateEmail.asp#Result3), but I have hard time reading classic asp, and it seams that it uses some third-party library... Does someone have code for smtp validation in c#, and/or general explanation of how it works?

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  • Postfix logs missing information on delivery status (postfix/smtp message)

    - by hegemon
    I noticed a problem with postfix logs, that information on some of emails delivery status is missing. The issue affects about 1% of emails. "Healthy" log: <server># grep 8EB992EFBB44 postfix_log/mail04.log Jun 5 03:09:29 mail04 postfix/smtpd[8537]: 8EB992EFBB44: client=xxx.xxx.xxx[xxx.xxx.xxx.xxx] Jun 5 03:09:29 mail04 postfix/cleanup[34349]: 8EB992EFBB44: message-id=<[email protected]> Jun 5 03:12:02 mail04 postfix/qmgr[76377]: 8EB992EFBB44: from=<[email protected]>, size=48845, nrcpt=1 (queue active) Jun 5 03:15:12 mail04 postfix/smtp[35058]: 8EB992EFBB44: to=<[email protected]>, relay=mx.baz.com[xxx.xxx.xxx.xxx]:25, conn_use=70, delay=343, delays=153/190/0/0.24, dsn=2.0.0, status=sent (250 ok) Jun 5 03:15:12 mail04 postfix/qmgr[76377]: 8EB992EFBB44: removed "Broken" log: <server># grep F3C362EF37CA postfix_log/mail04.log Jun 5 04:03:27 mail04 postfix/smtpd[39666]: F3C362EF37CA: client=xxx.xxx.xxx[xxx.xxx.xxx.xxx] Jun 5 04:03:27 mail04 postfix/cleanup[41287]: F3C362EF37CA: message-id=<[email protected]> Jun 5 04:03:28 mail04 postfix/qmgr[76377]: F3C362EF37CA: from=<[email protected]>, size=48892, nrcpt=1 (queue active) ** here should be a log line from postfix/smtp but there is none ** Jun 5 04:03:29 mail04 postfix/qmgr[76377]: F3C362EF37CA: removed Background information: system: FreeBSD xxx.xxx.xxx 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011 [email protected]:/usr/obj/usr/src/sys/GENERIC amd64 Postfix is installed inside jail. Logs are on the same machine, log dir is mounted thru nullfs. The site has spikes of heavy load, causing disks (local) to run at 100%. Update The log is rotated daily, current size is ~ 500MB. I made a test by queuing 99000 messages to same destination (in order to rule out dns/network/mx issues). 5715 messages don't have any DSN record. Failed messages queue time is spread evenly over time, i don't see any time-bound issues. Some undelivered emails: envelopeid | processed_time --------------+---------------------------- 8D7652EF3BAE | 2012-06-06 13:19:11.072715 DD53A2EF3C5C | 2012-06-06 13:33:24.374783 8C52F2EF4E3F | 2012-06-06 13:39:15.810616 BBC572EF525C | 2012-06-06 13:44:22.762812 E95822EF54D1 | 2012-06-06 13:52:01.134533 839DD2EF4FBB | 2012-06-06 14:13:48.511236 017EE2EF6234 | 2012-06-06 15:04:48.618963 Those are a few picks, such records of undelivered email occur almost every second. <server># egrep '(8D7652EF3BAE|BBC572EF525C|017EE2EF6234)' mail04.log Jun 6 13:19:10 mail04 postfix/smtpd[20350]: 8D7652EF3BAE: client=xxx.xxx.xxx[xxx.xxx.xxx.xxx] Jun 6 13:19:10 mail04 postfix/cleanup[21024]: 8D7652EF3BAE: message-id=<[email protected]> Jun 6 13:19:10 mail04 postfix/qmgr[7939]: 8D7652EF3BAE: from=<[email protected]>, size=63718, nrcpt=1 (queue active) Jun 6 13:19:11 mail04 postfix/qmgr[7939]: 8D7652EF3BAE: removed Jun 6 13:44:22 mail04 postfix/smtpd[20346]: BBC572EF525C: client=xxx.xxx.xxx[xxx.xxx.xxx.xxx] Jun 6 13:44:22 mail04 postfix/cleanup[24811]: BBC572EF525C: message-id=<[email protected]> Jun 6 13:44:22 mail04 postfix/qmgr[7939]: BBC572EF525C: from=<[email protected]>, size=63758, nrcpt=1 (queue active) Jun 6 15:04:49 mail04 postfix/smtpd[20344]: 017EE2EF6234: client=xxx.xxx.xxx[xxx.xxx.xxx.xxx] Jun 6 15:04:49 mail04 postfix/cleanup[35585]: 017EE2EF6234: message-id=<[email protected]> Jun 6 15:04:49 mail04 postfix/qmgr[7939]: 017EE2EF6234: from=<[email protected]>, size=63706, nrcpt=1 (queue active) <server># <server># find /var/spool/postfix/active/ -type f -print | wc -l 1 <server># IMPORTANT: As you can see above some of emails doesn't event have the removed line.

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  • Proper configuration for Windows SMTP Virtual Server to only send email from localhost, and tracking down source of spam emails

    - by ilasno
    We manage a server that is hosted on Amazon EC2, which has web applications that need to be able to send outgoing email. Recently we received a notice from Amazon about possible email abuse on that server, so i've been looking into it. It's Windows Server Datacenter (2003, i guess), and uses SMTP Virtual Server (you know, the one that requires IIS 6 for admin). The settings on the Access tab are as follows: - Authentication: Anonymous - Connection: Only from 3 ip addresses (127.0.0.1 and 2 others that refer to that server) - Relay: Only from 3 ip addresses (127.0.0.1 and 2 others that refer to that server) In the SMTP logs there are many entries like the following: 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionCommand SMTPSVC1 FROM: 0 0 4 0 26364 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionResponse SMTPSVC1 250+ok 0 0 6 0 26536 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionCommand SMTPSVC1 TO: 0 0 4 0 26536 SMTP - - - - 2012-02-08 23:43:56 64.76.125.151 OutboundConnectionResponse SMTPSVC1 250+ok 0 0 6 0 26707 SMTP - - - - ([email protected] is sending quite a lot of emails :-/) Can anyone confirm if the SMTP server settings seem correct? I'm also wondering if a web application on the machine could be exposing a contact form or something that would allow this sort of abuse, looking into that (and how to look into that) further.

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  • Enable VRFY verb in Exchange 2007

    - by m0sa
    Is there a way to enable the VRFY command on the Exchange server. I know this command is a security risk, but the server sits behind a firewall, and is not accessible from the internet. I would just use it as a in-box. The mail traffic would be forwarded from my home coded SMTP server, which would check for the existence of the exchange mailbox with the VRFY command. I only found this on the internet, but this is only for legacy versions of Exhange.

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  • How important are PTR records for Email Servers?

    - by Kyle Brandt
    Does anyone know of any studies done to show how much email will be rejected if there is not ptr record for the SMTP banner name of an email server? Are reverse checks always done when enabled, or is it sometimes configured so if an spam program considers an email 'iffy', the reverse check is done?

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  • Suggestions on mail servers

    - by Dejan.S
    Hi. I got a app sending massive newsletters and so far I been using the regular smtp within the iis7. I been looking at mail servers and There are plenty out there and I wonder what your tips and experiences are on this? What mail servers are good and easy to use with windows server 2008, iis7.. Thanks

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