Hello list, I received a message from my mail-daemon:
From: Mail Delivery System <mailer-dae...@myserver.example.com> To: Postmaster Subject: Postfix SMTP server: errors from ahost Transcript of session follows. Out: 220 myserver.example.com ESMTP Postfix In: EHLO ahost.example.com ... In: DATA Out: 354 End data with <CR><LF>.<CR><LF> Out: 451 4.3.0 Error: queue file write error In: QUIT Out: 221 2.0.0 Bye I investigated the problem and found out that my content filter caused the problem. The content filter, which is running as a proxy, took longer than $smtpd_proxy_timeout to process the message. After finishing the message the content filter submitted it back to postfix which finally delivered it. What makes me wonder is, that I can't find a hint about the 'queue file write error' in the logfile. From the log it looks as if there wasn't any problem with the message a all. Is that the intended behavior or are there some missing log lines? mail.log: postfix/smtpd[9540]: 87ED8DBA1B: client=ahost[A.B.C.D] postfix/cleanup[10812]: 87ED8DBA1B: message-id=<CAF1z6XimHQx =1ATuCx=yvtgk-p80xphhdicqlo6zkmmhbb-...@ahost.example.com> postfix/qmgr[5468]: 87ED8DBA1B: from=<au...@ahost.example.com>, size=1145299, nrcpt=1 (queue active) postfix/smtp[10059]: 87ED8DBA1B: to=<myu...@example.com>, relay=example.com[X.Y.Z.Z]:25, delay=0.56, delays=0.11/0/0.12/0.32, dsn=2.0.0, status=sent (250 Ok: queued as C8428C4C002) postfix/qmgr[5468]: 87ED8DBA1B: removed Thanks for your help. Stefan
