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6 domains of which 3 get error 452 and mail is stuck in outgoing queue

    Question

  • Hi All,

    We have an on premises server hosting 6 domain names. 4 of these work perfectly for send receive however 2 (the same 2) will not send with mail stuck in the queue but will receive.

    The 2 that will not send and are stuck in the queue get error 452 which is usually due to resources however all resources are fine. We have checked the domains to ensure they are not on any block lists etc.

    The 6 domains have worked perfectly for over 18 months and the 2 that started to fail to send both failed at around the same time.

    There are no issues we can see in the event viewer.

    Can anyone shed any light on where else we can look...???

    Many thanks.


    • Edited by catsystems Tuesday, April 26, 2016 12:17 PM
    Tuesday, April 26, 2016 12:10 PM

Answers

  • Perhaps you are having trouble with recipient servers.  First, in the queue, look at the error message that's coming back.  Please feel free to post more than that three-digit code.  For more visibility, enable SMTP protocol logging on the send connector and then look at the protocol logs to see what error the recipient's server is returning.

    Some general things I can suggest are to ensure that your DNS PTR record is properly in place for your sending server, and that your SPF records properly reflect the way you send mail.


    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!


    Tuesday, April 26, 2016 3:46 PM
    Moderator

All replies

  • Perhaps you are having trouble with recipient servers.  First, in the queue, look at the error message that's coming back.  Please feel free to post more than that three-digit code.  For more visibility, enable SMTP protocol logging on the send connector and then look at the protocol logs to see what error the recipient's server is returning.

    Some general things I can suggest are to ensure that your DNS PTR record is properly in place for your sending server, and that your SPF records properly reflect the way you send mail.


    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!


    Tuesday, April 26, 2016 3:46 PM
    Moderator
  • Hi Ed.. many thanks for the reply and advice. While writing this issue up on TechNet we had also dropped a support ticket to the ISP to see if for any reason they were blocking these 2 domains which by now had had been blocking all outgoing mail for over 36 hours only to find that when we went to follow your suggestion all the mail had been released. Was it a gremlin or was it the ISP...??? We're waiting for them to reply and I will post back.

    Again many thanks for your input.

    Wednesday, April 27, 2016 12:25 PM
  • You're welcome.  Happy to have helped.  Please feel free to mark responses as helpful and/or the answer as appropriate.

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Wednesday, April 27, 2016 4:17 PM
    Moderator