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  • How to reject messages to unknown user in sendmail cooperating with MS-Exchange?

    - by user71061
    Hi! I have an MS Exchange 2003 configured as a mail server for an organization. As this server is located in this organization internal network and I don't want to expose it directly over internet, I have second server - linux box with sendmail - configured as intelligent relay (it accept all messages from internet addressed to @my_domain, and forward it to internal Exchange serwer, and accepts all messages from this internal Exchange server and forward it over internet). This configuration work's fine, but I want to eliminate messages addressed to not exiting users as early as possible. Good solution could be Enabling on Exchange server function of filtering recipients together with "tar pitting", but in my case this dosn't solve problem, because before any message reach my Exchange server (which could eventually reject it), it has to be already accepted by sendmail server, sitting in front of this Exchange server. So, I want to configure my sendmail server in such a way, that during initial SMTP conversation it could query somehow my Exchange server checking whether recipient address is valid or not, and based on result of this query, accept or reject (possibly with some delay) incoming message in a very early phase. In fact, I have already solved this issue by writing my own, simple sendmail milter program which checks recipient address against text file with list of valid addresses. But this solution is not satisfying me any longer, because it requires frequent updates of this file, and due to lack of time/motivation/programming skills, I don't want to cope further with my source code, adding to it functionality of querying my Exchange server. Maybe I can achieve desired effect by configuring any component of already available linux software. Any ideas?

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  • How can I set up sendmail to forward all mail to an external MTA?

    - by unknown (google)
    We have multiple applications that currently talk SMTP to an external MTA. The emails have arbitrary destination domains (they're emails to be sent to our users), but all from the same internal domain ([email protected]). I want to set up an internal MTA (i guess with sendmail) that queues all mails, and have the internal MTA forward these emails to the external MTA, because the external MTA occasionally goes down and this causes various problems in our applications. I figure I can set up sendmail as a queuing middleware. If the above assumptions are correct, what would the sendmail configuration look like? The 'mailertable' feature looks promising, and so does 'SMART_HOST'. Any thoughts before I explore these possibilities? Jae

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  • How to configure sendmail to relay local user mail to public host?

    - by Chau Chee Yang
    I am using Linux/Fedora's sendmail as my mail server. The server do not has a public domain name. It connect to Internet via dial-up. There are few users in the server. I have successfully configure my sendmail to relay mail to public host (via smart_host): # mail <user>@gmail.com [email protected] receive mail from this private host. However, if I send a mail to local user (without domain name): # mail <user> All mails are deliver to my server's mail spooler (/var/spool/mail). I wish all mails send to local user may relay to a public domain that I have registered, is that possible to do so with sendmail? mail user1 will send mail to [email protected] mail user2 will send mail to [email protected]

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  • How can I limit the amount of messages SendMail will recieve in a single incoming connection?

    - by Mike B
    Is there a way to limit how many messages can be received by SendMail in a given SMTP session? I have a SendMail server and an upstream application server is trying to send dozens (potentially hundreds) of messages to it in a single SMTP session (ehlo... mail from... rcpt to... data... rset... mail from... etc). This is causing resource strain on the box since the traffic isn't effectively load balanced. I'd like to implement a policy to have sendmail only allow up to X number of messages in a given SMTP session after which it will require the remote host to reconnect again. I noticed that there's a confCONNECTION_RATE_THROTTLE option but that seems to protect more against multiple connections occurring at once - not a single connection sending a bunch of emails.

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  • Minimal setup for sendmail to send outgoing email only?

    - by Michael
    I run a simple server that I administrate remotely, and I need it to be able to send an email to my personal email address every time an error occurs. With the default setup on Ubuntu, sendmail just accumulates emails in /var/spool/mail that are to be sent locally, but I need it to go to an external email. The tutorials I've found all talk about setting up postfix/sendmail as a full-fledged email server, but I just need outgoing only, no external logins. Is there an easy way to do this?

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  • How to generate new CSRs for TLS use in sendmail?

    - by Mikey B
    SendMail 8.13.8 | CentOS 5.x Hi Guys, I'm using ca-signed TLS certificates on my sendmail server and they are up for renewal soon. Our new CA doesn't like our old CSR so I need to generate a new CSR. Can someone point me to the procedure for doing this (without affecting the production certs that are already in use)? I'm paranoid of overwriting the old TLS certs in the process of generating a CSR. Most of the instructions I've found are for implementing self-signed TLS certs -- which isn't an option for me at this time. I'm thinking it would something like: openssl req -new -nodes -out new-tls.csr -keyout new-tls-private.key But I wasn't sure if I was missing some options there such as the -x509 option... -M

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  • Where are incoming messages queued/stored when sendmail is communicating with a milter?

    - by Mike B
    CentOS 5.x | SendMail I'd like to better understand how milter hand-offs work. We a remote MTA initiates an SMTP session, my understanding is that Sendmail hands the message data off to the milter during that session. Where/how is this message data stored? Is this all done in memory? Or is there a "queue" area where message data for milter is stored for pickup by the milter? If it helps, let's say I'm calling a milter like this: INPUT_MAIL_FILTER(`foo', `S=unix:/var/lib/foo/foo.sock, F=T, T=C:5m;S:3m;R:5m;E:5m')dnl

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  • Obscure SPUtility.SendMail Behavior When Manually Passing in Mail Headers

    - by Damon
    There are two ways to send mail in SharePoint: you can either use the mail components from the System.Net namespace, or you can send email using SharePoint's SPUtility.SendMail method.  One of the benefits of the SPUtility.SendMail method is that it uses the mail configuration from SharePoint, so you can manage settings in Central Administration instead of having to go through and modify your web.config file.  SPUtility.SendMail can get the job done, but it's defiantly not as developer friendly as the components from the System.Net namespace.  If you want to CC someone on an email, for example, you do NOT have a nice CC parameter - you have to manually add the CC mail header and pass it into the SPUtility.SendMail method.  I had to do this the other day, and ran into a really obscure issue. If you do NOT pass the headers into the method then SharePoint sends the email using the From Address configured in the Outgoing Mail settings in Central Admin.  If you pass headers into the method, but do not include the from header, then SharePoint sends the mail using the email address of the current user. This can be an issue if your mail server is setup to reject an email from an invalid email address or an email address that is not on your domain.  The way to fix this issue is to always pass in the from header.  If you want to use the configured From address, then you can do the following: SPWebApplication webApp = SPWebApplication.Lookup(new Uri(SPContext.Current.Site.Url)); StringDictionary headers = new StringDictionary(); headers.Add("from", webApp.OutboundMailSenderAddress);

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  • sendmail error "Relaying denied. Proper authentication required. (state 14)."

    - by renevdkooi
    I am an absolute newB on sendmail, now I installed sendmail, configured it (as far as i know) added localhost-names, added access entries added virtuser entry, opened port 25 in iptables. Now when I connect from another location on the internet, and use telnet server.com 25 and use manual SMTP commands (HELO, MAIL From etc) the mail goes and arrives and gets put to the right user. but When I use another client and it's relayed by (for example google) I get this error back: Relaying denied. Proper authentication required. (state 14). What setting did I forget? Any config files I need to post so you can help me? I use CentOS 5.5 and the latest sendmail rpm

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  • How to set up server side message filters on sendmail/Imap server?

    - by Steve Prior
    I currently have message filters set up in Thunderbird to put incoming email messages from various sources in appropriate server side folders. Since I envision starting to use a smartphone (Android) based IMAP client which doesn't support folders or message filters I'd like to move these filters server side and take them off the clients. The Linux server email system is sendmail and UW IMAP. Can someone steer me in the direction of setting up such filters on the server side?

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  • How to use perl for SMTP connection with user and SSL Auth and send emails with attachment

    - by Octopus
    I am using a SMTP mail server which require user + ssl authentication for connection. I am looking for the perl modules to connect to the mail server and send emails but doesn't found anything helpful. Any suggestion for perl module or any perl code would be really appreciated. EDIT I have tried to use Mail::Sendmail and Net::SMTP::SSL to connect to the sendmail server and send mail. Below is the sample code but getting the error user unknown. Error: mail: Net::SMTP::SSL=GLOB(0x9599850) not found RCPT TO: error (550 5.1.1 <[email protected]>... User unknown). Code: #!/usr/bin/perl use strict; use warnings; use Mail::Sendmail; use Net::SMTP::SSL; my %mail = ( #To=> 'No to field this time, only Bcc and Cc', From=> '[email protected]', Cc=> '[email protected]', # Cc will appear in the header. (Bcc will not) Subject => 'Test message', 'X-Mailer' => "Mail::Sendmail version $Mail::Sendmail::VERSION", ); $mail{Smtp} = Net::SMTP::SSL->new("mail.server.com", Port=> 465); $mail{auth} = {user=>'username', password=>"password", required=>1 }; $mail{'X-custom'} = 'My custom additionnal header'; $mail{Message} = "The message key looks terrible, but works."; # cheat on the date: $mail{Date} = Mail::Sendmail::time_to_date( time() - 86400 ); if (sendmail %mail) { print "Mail sent OK.\n" } else { print "Error sending mail: $Mail::Sendmail::error \n" } print "\n\$Mail::Sendmail::log says:\n", $Mail::Sendmail::log;

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  • Sendmail /etc/hosts and DNS ... what is the correct way?

    - by ben
    I found one tutorial on setting up sendmail that says that in the /etc/hosts file, "The entry for 127.0.0.1 must always be followed by the fully qualified domain name (FQDN) of the server." Like so: 127.0.0.1 bigboy.my-site.com localhost.localdomain localhost bigboy (This tutorial is here). However, I can't find anyone else suggesting something like that. instead most people seem to put some combination of localhost and localdomain.localhost after 127.0.0.1, and then some variant of the fully qualified domain name after the public ip address. What is the correct way?

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  • What would cause my SendMail server not to acknowledge receiving a TCP Sequence?

    - by Mike B
    My TCP/IP Stack knowledge is a little rusty so please bear with me.... I have a CentOS 5.7 server with SendMail and am having seeing intermittent timeout issues sending email (particularly larger email) to other remote domains. It doesn't happen with all attachments or recipient domains. Just some. After some extended troubleshooting, I think I've narrowed it down to TCP Sequences not being acknowledged. Here's a breakdown of the TCP session from a packet capture I collected directly on my MTA (fooMTA): Packet 1 - 11: Standard TCP handshake followed by initial SMTP conversation. No errors. Packet #12 Recipient MTA: TCP sequence 231. Ack 91. Packet #13 FooMTA: TCP sequence 91. Ack 305. Packet #14 FooMTA: TCP sequence 1115. Ack 305. Packet #15 Recipient MTA: TCP sequence 305. Ack 2495. Packet #16 FooMTA: TCP sequence 2495. Ack 305. Packet #17 FooMTA: TCP sequence 5255. Ack 305. Packet #18: Recipient MTA: TCP sequence 305. Ack 5255. Packet #19: FooMTA: TCP sequence 6635. Ack 305. Packet #20: FooMTA: TCP sequence 8015. Ack 305. Packet #21: Recipient MTA: TCP Sequence 305. Ack 8015. Packet #22: FooMTA: TCP Sequence 10775. Ack 305. Packet #23: FooMTA: TCP Sequence 13535. Ack 305. Packet #24: Recipient MTA: TCP sequence 305. Ack 10775 Packet #25: FooMTA: TCP Sequence 14915. Ack 305 It keeps going like this with my server still thinking it hasn’t received sequence 305… in response the remote side eventually retransmits its prior data thinking that it never arrived. Eventually the gap gets so large that no new data is sent and the remote MTA keeps retransmitting old stuff. This contributes to an exponential backoff and eventually the remote side gives up. What’s strange to me is that I see the “missing” TCP sequence (305 in this case) arriving back to my server (via a packet capture collected directly from fooMTA) So I don’t get why my server keeps asking for it. Could this be firewall related? What would be the next step in troubleshooting?

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  • sendmail and local mail server?

    - by Hailwood
    For testing emails I don't want to actually send an email out (and can't anyway as ISP blocks port 25). I have installed Sendmail, and what I want to do is install a mail server on the same pc that is sending the email which I can simply send the emails to, and receive them on my pc. so I am looking for a couple of guides. install and configure sendmail correctly for this. install and configure a mail server correctly for this. setup mail client (evolution) to connect to the mail server Can anyone help with this?

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  • vCenter appliance won't use mail relay server

    - by Safado
    tl;dr: - sendmail is configured to use a relay server but still insists on using 127.0.01 as the relay, which results in mail not being sent. We have the open source vCenter appliance (v 5.0) managing our ESXi cluster. When connected to it via vSphere Client, you can configure the SMTP relay server to use by going to Administration > vCenter Server Settings > MAIL. There you can set the SMTP Server value. I looked through their documentation and also confirmed on the phone with support that all you have to do to configure mail is to put in the relay IP or fqdn in that box and hit OK. Well, I had done that and mail still wasn't sending. So I SSH into the server (which is SuSE) and look at /var/log/mail and it looks like it's trying to relay the email through 127.0.0.1 and it's rejecting it. So looking through the config files, I see there's /etc/sendmail.cf and /etc/mail/submit.cf. You can configure items in /etc/sysconfig/sendmail and run SuSEconfig --module sendmail to generate those to .cf files based on what's in /etc/sysconfig/sendmail. So playing around, I see that when you set the SMTP Server value in the vCenter gui, all that it does is change the "DS" line in /etc/mail/submit.cf to have DS[myrelayserver.com]. Looking on the internet, it would appear that the DS line is really the only thing you need to change in order to use a relay server. I got on the phone with VMWare support and spent 2 hours trying to modify ANY setting that had anything to do with relays and we couldn't get it to NOT use 127.0.0.1 as the relay. Just to note, any time we made any sort of configuration change, we restarted the sendmail service. Does anyone know whats going on? Have any ideas on how I can fix this?

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  • sendmail sending mail to recipients I don’t know of; possible spam host

    - by Quintin Par
    Recently I did an audit of my machine with logwatch and found out that my machine sends around 582 mails everyday. STATISTICS ---------- Messages To Recipients: 582 Addressed Recipients: 582 Bytes Transferred: 444985 Messages No Valid Rcpts: 0 SMTP SESSION, MESSAGE, OR RECIPIENT ERRORS ------------------------------------------ Next day STATISTICS ---------- Messages To Recipients: 153 Addressed Recipients: 279 Bytes Transferred: 8613451 Messages No Valid Rcpts: 0 SMTP SESSION, MESSAGE, OR RECIPIENT ERRORS ------------------------------------------ How can I audit more to find out the email ids to where did is send, program which schedules this etc?

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  • sendmail: how can I restrict access to clients that only have a valid certificate?

    - by lxg
    I want to reject all connections that don't present a valid SSL/TLS certificate. First of all is the access db file the correct one to be changing? I have already tried using the basic rule given in the documentation CertIssuer:/C=US/ST=California/O=endmail.org/OU=private/CN= Darth+20Mail+20+28Cert+29/[email protected] RELAY This will obviously need a rule afterward to filter and reject all that don't present the cert? Does anyone have any pointers as to what syntax I should use? wildcards? lxg

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  • Sendmail: external alias not receiving relayed mail under certain circumstances.

    - by ben
    I have set up an alias in /etc/mail/aliases like this: user: [email protected] This relay DOES work when I telnet to example.com 25 and send mail to [email protected] (where example.com is my domain); it indeed turns up in [email protected] inbox. Also mail sent from my server at example.com is generally deliverable to this same email address, [email protected]. HOWEVER, the relay DOES NOT work when I send mail from [email protected] to [email protected], expecting it to be relayed back to [email protected]. The mail.log shows it being received and sent just fine, so I guess it is being blocked by gmail for some reason. Why though? As I said, gmail generally does except mail from this server.

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  • SPUtility.SendMail and the 2048 Character Limit

    - by Damon
    We were in the middle of testing a web part responsible for gathering information from visitors to our Client's website and emailing it to someone responsible for responding to the request.  During testing, however, it was brought to our attention that the message was cutting off at 2048 characters.  Now, 2048 is one of those numbers that is usually indicative of some computational limit, but I was hopeful that Microsoft had thought through the possibility of emailing more than 2048 characters from SharePoint.  Luckily I was right. and wrong. As it turns out, SPUtility.SendMail is not limited to any specific character limit as far as I can tell.  However, each LINE of text that you send via SendMail cannot exceed 2048 characters.  Since we were sending an HTML email it was constructed entirely without line breaks, far exceeding the 2048 character limit and ultimately helping to educate me about this obscure technical limitation whose only benefit thus far is offering me something to rant about on my blog.  The fix is simple, just put in a carriage return and a line break often enough to avoid going past the 2048 character limit.  I'm sure someone can present a great technical reason for the 2048 character limit, but it seems fairly arbitrary since the "\r\n" that got appended to the string are ultimately just characters too.

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  • php mail() isn't working.

    - by Tristan
    Hello, i just figured out that the mail() function isn't working i'm under Debian, i installed postfix because a friend told me to (although i didn't configure it). When i do a phpinfo() i've got : sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i but in this directories i don't have anything like sendmail Do you have an idea, on what i should do to get mail() working ? Thank you

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  • Linux: Send mail to external mail box from a server with that user's hostname

    - by dtbarne
    I've got sendmail running on a linux box. Let's say the hostname of the box is bar.com. If I run the following command, I don't receive the email (which is hosted with a third party), presumably due to the hostname pointing to the local machine. echo "Test Body" | mail -s "Test Subject" [email protected] Is there any way to get this to work so that I can receive emails at my third party email address even though it has the same hostname? Do I have to change the hostname of this server (not preferred)? It may be worth noting that I created a user "foo" on my machine and noticed that the mailbox for that account is empty. I noticed these log entries, which may or may not be relevant: Jun 28 01:09:48 bar sendmail[14338]: p5S59min014338: from=apache, size=80, class=0, nrcpts=1, msgid=<[email protected]>, relay=apache@localhost Jun 28 01:09:48 bar sendmail[14339]: p5S59mIA014339: from=<[email protected]>, size=293, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.$ Jun 28 01:09:48 bar sendmail[14338]: p5S59min014338: [email protected], ctladdr=apache (48/48), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30080, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p5S59mIA$ Jun 28 01:09:48 bar sendmail[14340]: p5S59mIA014339: to=<[email protected]>, ctladdr=<[email protected]> (48/48), delay=00:00:00, xdelay=00:00:00, mailer=local, pri=30495, dsn=2.0.0, stat=Sent

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