On Fri, Jan 13, 2012 at 8:54 AM, Ismail Ozatay <ismailozatay at gmail.com> wrote: > I having a problem with my sendmail server running on centos 5.7 x64. > Sometimes when we send an email to microsoft exchange servers, sendmail > says deferred or timeout. I do not know what is happening. Here is some > details; > > [root at avgw ~]# sendmail -v -qRxxx at xxx.gov.qa > > Running /var/spool/mqueue/q0B7caw9023076 (sequence 1 of 2) > <xxx at xxx.gov.qa>... Connecting to smtp.xxx.gov.qa. via esmtp... > 220 mail.xxx.gov.qa Microsoft ESMTP MAIL Service ready at Fri, 13 Jan > 2012 16:37:28 +0300 > >>> EHLO avgw.yyy.com > 250-mail.xxx.gov.qa Hello [95.9.x.x] > 250-SIZE 10485760 > 250-PIPELINING > 250-DSN > 250-ENHANCEDSTATUSCODES > 250-AUTH > 250-8BITMIME > 250-BINARYMIME > 250 CHUNKING > >>> MAIL From:<xxx at yyy.com> SIZE=939155 > 250 2.1.0 Sender OK > >>> RCPT To:<xxx at xxx.gov.qa> > >>> DATA > 250 2.1.5 Recipient OK > 354 Start mail input; end with <CRLF>.<CRLF> > timeout writing message to smtp2.xxx.gov.qa.: Connection reset by > smtp2.xxx.gov.qa. > <xxx at xxx.gov.qa>... Deferred This looks like a problem on the receiving side. They are probably doing virus/spam scanning or something slow. Or they are overloaded or crashed. Unless you've changed something, your side should allow an hour or so for this timeout. > [root at avgw ~]# telnet smtp2.xxx.gov.qa 25 > Trying 89.211.40.246... > Connected to smtp2.xxx.gov.qa (89.211.x.x). > Escape character is '^]'. > 220 mail.xxx.gov.qa Microsoft ESMTP MAIL Service ready at Fri, 13 Jan > 2012 17:54:56 +0300 > > It seems everything is ok but i do not know what is the problem with > exchange communication. Has anybody experienced this issue? If it eventually retries and completes there is nothing wrong on your side. -- Les Mikesell lesmikesell at gmail.com