On Sat, Mar 11, 2017 at 11:46:51PM -0800, Ian Zimmerman wrote: > 2017-03-11 23:27:59 acl_check_mail: mail from hol-info-bounces@???
> 2017-03-11 23:30:57 SMTP connection from disorder.example.com (acedia.example.com) [12.34.56.78]:55572 lost while reading message data (after header)
>
> Any sudden enlightement or should I reach for tcpdump?
Looks as broken Path MTU Discovery. Check for ICMP filtering on your
nearest gateway and run tcpdump for "host 12.34.56.78".
--
Eugene Berdnikov
