On Thu, Jul 19, 2018 at 02:30:52PM -0400, James B. Byrne wrote:
> > You really need to show more of the (non-verbose) logging for this
> > session and the below. You're cutting out critical context.
>
> Jul 19 13:40:39 mx31 postfix-p25/smtpd[96635]: NOQUEUE:
> client=mail.rosedale.ca[66.135.118.147]
> Jul 19 13:40:39 mx31 postfix-p25/smtpd[96635]: lost connection after
> DATA (0 bytes) from mail.rosedale.ca[66.135.118.147]
> Jul 19 13:40:39 mx31 postfix-p25/smtpd[96635]: disconnect from
> mail.rosedale.ca[66.135.118.147] ehlo=1 mail=1 rcpt=1 data=0/1
> commands=3/4
The sending client is encountering networking issues. Unrelated
to Postfix or TLS. Your new systems may have enabled TCP window
scaling or ECN, or other TCP features that are giving the sending
system indigestion. Or just a vanilla MTU issue. You could try
to disable window scaling, which makes data transfer slower for
senders with a high bandwidth delay product, but email is generally
tolerant of a few seconds to minutes of extra delay.
Stating carefully at PCAP files might help.
> Jul 19 13:40:39 mx31 postfix-p25/smtpd[40715]: disconnect from
> mail.rosedale.ca[66.135.118.147] ehlo=1 mail=1 rcpt=1 data=0/1
> commands=3/4
Much the same, no TLS in sight.
--
Viktor.
