In my log I found this: Jul 21 07:23:09 mail-cvk postfix/smtp[7329]: 3xDK0Z6RBRz1Z1wy: enabling PIX workarounds: disable_esmtp delay_dotcrlf for mail.unimed.de[62.154.176.144]:25
According to http://www.electric-spoon.com/doc/postfix/html/postconf.5.html#smtp_pix_workaround_maps "By default, the workaround is turned off for mail that is queued for less than 500 seconds. In other words, the workaround is normally turned off for the first delivery attempt." % fgrep 3xDK0Z6RBRz1Z1wy /var/log/mail.log Jul 21 07:22:54 mail-cvk postfix/smtpd[5374]: 3xDK0Z6RBRz1Z1wy: client=s-mx14-ht01.charite.de[10.32.37.105] ... Jul 21 07:23:09 mail-cvk postfix/smtp[7329]: 3xDK0Z6RBRz1Z1wy: enabling PIX workarounds: disable_esmtp delay_dotcrlf for mail.unimed.de[62.154.176.144]:25 Jul 21 07:23:10 mail-cvk postfix/smtp[7329]: 3xDK0Z6RBRz1Z1wy: to=<[email protected]>, relay=mail.unimed.de[62.154.176.144]:25, delay=16, delays=15/0/0.06/1.2, dsn=2.0.0, status=sent (250 Ok: queued as B51D41068C5) Jul 21 07:23:10 mail-cvk postfix/qmgr[7149]: 3xDK0Z6RBRz1Z1wy: removed That's 16s, why were the PIX workarounds triggered anyway? Another: Jul 21 08:02:48 mail-cvk postfix/smtpd[10518]: 3xDKtc5hRMz1Z2wL: client=s-mx14-ht01.charite.de[10.32.37.105] ... Jul 21 08:02:52 mail-cvk postfix/smtp[8678]: 3xDKtc5hRMz1Z2wL: enabling PIX workarounds: disable_esmtp delay_dotcrlf for imh.rsys2.net[12.130.135.43]:25 Jul 21 08:02:53 mail-cvk postfix/smtp[8678]: 3xDKtc5hRMz1Z2wL: to=<[email protected]>, relay=imh.rsys2.net[12.130.135.43]:25, delay=6.5, delays=5/0/0.55/0.93, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 549AF1219F4) Jul 21 08:02:53 mail-cvk postfix/qmgr[7149]: 3xDKtc5hRMz1Z2wL: removed That's 6s. Is the "PIX state" cached? # postconf -n|fgrep pix smtp_pix_workarounds = delay_dotcrlf # postconf -d mail_version mail_version = 3.2-20170122
