We continue to receive messages addressed to Postmaster from our MX host. All appear to be related to a single original transmission. The issue seems to be some sort of time-out with the Amavis proxy. Is there some way of determining exactly what is wrong with this specific sender's message?
The Postmaster receives this messages: Transcript of session follows. Out: 220 inet08.hamilton.harte-lyne.ca ESMTP Postfix In: EHLO mail-it0-f47.google.com Out: 250-inet08.hamilton.harte-lyne.ca Out: 250-PIPELINING Out: 250-SIZE 20480000 Out: 250-ETRN Out: 250-STARTTLS Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: STARTTLS Out: 220 2.0.0 Ready to start TLS In: EHLO mail-it0-f47.google.com Out: 250-inet08.hamilton.harte-lyne.ca Out: 250-PIPELINING Out: 250-SIZE 20480000 Out: 250-ETRN Out: 250-AUTH LOGIN PLAIN Out: 250-AUTH=LOGIN PLAIN Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: MAIL FROM:<x> SIZE=1701895 Out: 250 2.1.0 Ok In: RCPT TO:<y> Out: 250 2.1.5 Ok In: DATA Out: 354 End data with <CR><LF>.<CR><LF> Out: 451 4.3.0 Error: queue file write error Session aborted, reason: lost connection For other details, see the local mail logfile The maillog contains these types of entries: 66 Apr 8 10:50:27 inet08 postfix-p25/smtpd[18374]: warning: timeout talking to proxy 127.0.0.1:10024 67 Apr 8 10:50:27 inet08 postfix-p25/smtpd[18374]: proxy-reject: END-OF-MESSAGE: 451 4.3.0 Error: queue file write error; from=<x> to=<y> proto=ESMTP helo=<mail-it0-f49.google.com> 68 Apr 8 10:50:27 inet08 postfix/cleanup[18523]: AE20261ED8: message-id=<20170408145027.ae20261...@inet08.hamilton.harte-lyne.ca> 69 Apr 8 10:50:27 inet08 postfix-p25/smtpd[18374]: disconnect from mail-it0-f49.google.com[209.85.214.49] 70 Apr 8 10:50:27 inet08 postfix/qmgr[17396]: AE20261ED8: from=<double-bou...@inet08.hamilton.harte-lyne.ca>, size=1429, nrcpt=1 (queue active) 71 Apr 8 10:50:28 inet08 postfix/smtp[18524]: AE20261ED8: to=<postmas...@inet08.hamilton.harte-lyne.ca>, orig_to=<postmaster>, relay=inet07.hamilton.harte-lyne.ca[216.185.71.27]:25, delay=0.56, delays=0.07/0.05/0.32/0.12, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 2FA418A69E) 72 Apr 8 10:50:28 inet08 postfix/qmgr[17396]: AE20261ED8: removed -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:byrn...@harte-lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3