On 3/28/2019 5:09 PM, Dale Harper wrote:
Hi All,
Cpanel environments have a artifical (“tar pitting”) delay in their smtp
transaction when receiving email.
Cpanel’s exim config has a “delay = 20secs”. (CPanel documentation:
https://documentation.cpanel.net/display/78Docs/Exim+Configuration+Manager+-+Basic+Editor#ACLOptions
Under - "Introduce a delay into the SMTP transaction for unknown hosts and
messages detected as spam.”)
I’m thinking that’s what is causing the following logged error sending from our
postfix server to Cpanel email addresses.
Final-Recipient: rfc822; em...@xyz.com
Original-Recipient: rfc822;addr...@xyz.com
Action: failed
Status: 4.4.2
Diagnostic-Code: X-Postfix; conversation with xyz.com[x.x.x.x]
timed out while receiving the initial server greeting
Sits in deferred and eventually fails.
This is now 2 different Cpanel hosting companies I’m seeing the same issue.
The receiving exim server's artificial delay is 20sec, I know postfix’s various
timeout defaults are well in excess of that (i.e. smtp_connect_timeout is
default at 30secs).
I’m taking responsibility and saying its my postfix server - as clearly most
servers are handling the smtp transaction delay just fine - thought not all! -
there is plenty of interwebs chatter out there about this exim delay = 20
causing timeouts.
If you’ve seen and dealt with this I’d really appreciate your advice thank you.
Dale
Have you adjusted the other smtp_*_timeout settings from their
default values?
In particular, this sounds as if you've reduced the
smtp_helo_timeout to something much less than the default 300s.
If you need more help, please show "postconf -n" and log entries
demonstrating the problem.
-- Noel Jones
