451 Temporarily unable to process your email. Please try again later.

Legin76

• November 12, 2015 03:59

Hi One of my servers appears to be bouncing some incoming emails with the error "451 Temporarily unable to process your email. Please try again later. (in reply to RCPT command)". It appears to be a bit random.. Some emails from the same sender will be received but others will bounce. I'm sure I've seen a setting that does something similar to this but can't find it now. CENTOS 6.7 x86_64 xenpv " WHM 11.52.1 (build 0)

• 

  cPanelMichael

  • November 12, 2015 14:40

  Hello :) You can review /var/log/exim_mainlog to determine the exact reason for the failure. EX:
  exigrep user@domain /var/log/exim_mainlog
  Thank you.

  0
• 

  Legin76

  • November 12, 2015 15:06

  It appears to be something to do with the grey listing... 2015-11-11 10:51:18 H=ftx-008-i765.relay.changedname.net [01.12.345.67]:7912 X=TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256 CV=no F= temporarily rejected RCPT : Deferred due to greylisting. Host: '01.12.345.67' From: 'email@domain.co.uk[/EMAIL]' To: 'email@receivingaddress.co.uk[/EMAIL]' SPF: 'unchecked' 2015-11-11 11:00:28 H=ftx-008-i771.relay.changedname.net [01.12.345.67]:14402 X=TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256 CV=no F= temporarily rejected RCPT : Deferred due to greylisting. Host: '01.12.345.67' From: 'email@domain.co.uk[/EMAIL]' To: 'email@receivingaddress.co.uk[/EMAIL]' SPF: 'unchecked'

  0
• 

  Legin76

  • November 12, 2015 15:10

  The Greylisting settings are as follows.. Deferral Period (in minutes) 10 Resend Acceptance Period (in minutes) 240 Record Expiration Time (in minutes) 4320 Bypass Greylisting for Hosts with Valid SPF Records Un-checked

  0
• 

  cPanelMichael

  • November 12, 2015 15:26

  Hello :) The logs indicate the second retry attempt was before the 10 minute deferral period. You can reduce the deferral period if you want to accept emails that are resent at a shorter duration: Greylisting - Documentation - cPanel Documentation Thank you.

  0
• 

  Legin76

  • November 12, 2015 15:36

  I've reduced it to 5 minutes although it appears that the IP is different for each send attempt. I thought the greylist bounce message was one that went to the server so it would retry and not to the sender. Would turning on "Bypass Greylisting for Hosts with Valid SPF Records" help?

  0
• 

  cPanelMichael

  • November 12, 2015 15:38

  Yes, you can enable that option if you want to allow email from hosts with valid SPF records to skip the greylisting functionality. Thank you.

  0

Please sign in to leave a comment.