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
