Noel Jones wrote:
Francisco Neira wrote:Hi all, Hope you can help me with this.I did a fresh install of Centos 5 with postfix-2.3.3-2 from RPMs, Spamassassin, Amavisd-new and Clamav. everything is going very good until I send messages to mail.osterlingfirm.com <http://mail.osterlingfirm.com> if the message is tiny, there are no problems anything bigger than 100k will receive the following: Sep 4 16:34:11 mail postfix/smtp[22137]: send attr original_recipient = [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Sep 4 16:34:11 mail postfix/smtp[22137]: send attr recipient = [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Sep 4 16:34:11 mail postfix/smtp[22137]: send attr dsn_orig_rcpt = rfc822;[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> Sep 4 16:34:11 mail postfix/smtp[22137]: send attr reason = conversation with mail.osterlingfirm.com <http://mail.osterlingfirm.com>[200.31.124.213 <http://200.31.124.213>] timed out while sending message body This is the reason why I tweaked (and probably exagerated) the smtp_data parameters.They have a M$ MTA and as I can read, a Symantec appliance as mailrelay:220 osterling08.osterlingfirm.com <http://osterling08.osterlingfirm.com> ESMTP Symantec Mail Security[Push the "Plain Text" button when posting from gmail]
Please post complete NON VERBOSE logging of a failed transaction. If someone needs verbose logging, they will ask for it.It may be helpful also to post a packet capture of a failed session. http://www.postfix.org/DEBUG_README.html#sniffer Are you able to send large mail to other sites successfully?If this happens with all sites you may have an MTU problem. Broken MTU is a networking problem, not a postfix problem - google for more info.And for a fresh install, why use musty old software? Current postfix is 2.5.5 - but this is probably not related to your problem. Hopefully you're not using years-old versions of SpamAssassin, amavisd-new, and clamav also.
Actually I am using the most recent versions of everything in the Centos repositories.
The same messages that are accepted in gmail, hotmail and my office's exim are rejected or at least not completed in that domain.
My logic tells me that the problem is caused by the receiving MTA but I need to demonstrate that with evidence to a cocky stubborn M$ postmaster.
Nevertheless, I generate the file with tcpdump and tomorrow morning I'll try to interpret it with wireshark.
Thanks for the ideas and excuse me for that first HTML posting. -- Francisco Neira Basso Especialista en Networking y Seguridad de la Información Mensaje enviado desde mi sauco :) Message sent from my sambucus peruviana
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