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Mail delivery troubles

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9 comments

  • megajosete10

    Hi,

    I'm having the exact same problem.
    Any help, our customers are desperate
    Thanks

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  • cPRex Jurassic Moderator

    Hey there!  You'll need to focus on one email issue at a time and track down the problem.  I would recommend sending an email on the server while watching the mail logs in real-time with this command:

    tail -f /var/log/exim_mainlog

    That will show you what the mail server is doing as you send the message.  The "retry time" and "host" errors you mention sound like a DNS issue of some sort, so sending that message again will likely have the same problem if it is indeed a DNS issue.

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  • megajosete10

    Thanks for the information, but I will detail the following:

    Nothing has been touched in the configuration, so this matter does not make sense.

    It does not always do this either, so getting the information is not always possible, because there are times when everything works ok.

    And third, if there are more users with the same problem from the same day, this problem is NOT normal because several users coincide on the same day with the same problems.

    What can we do, thank you.

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  • cPRex Jurassic Moderator

    I completely agree, but you'll still need to do some troubleshooting to find out the root cause of the issue.  Without checking the Exim log, there is no way to know what the issue may be, so that log has to be examined in order to fix the issue.

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  • megajosete10

    I attach two traces of emails with their errors:

     

    2024-10-08 21:53:07 SMTP connection from [212.227.126.187]:60281 (TCP/IP connection count = 1)
    2024-10-08 21:53:52 H=mout.kundenserver.de [212.227.126.187]:60281 X=TLS1.3:TLS_AES_256_GCM_SHA384:256 CV=no F=<grupovdt@grupovdt.net> temporarily rejected RCPT <info@xxxx.com>: Deferred due to greylisting. Host: '212.227.126.187' From: 'grupovdt@grupovdt.net' To: 'info@xxxx.com' SPF: 'unchecked'
    2024-10-08 21:53:52 SMTP connection from mout.kundenserver.de [212.227.126.187]:60281 D=45s closed by QUIT
    2024-10-08 21:53:54 SMTP connection from [127.0.0.1]:41114 (TCP/IP connection count = 1)

     

    2024-10-08 21:53:56 SMTP connection from [127.0.0.1]:47366 (TCP/IP connection count = 1)
    2024-10-08 21:53:56 SMTP connection from (localhost) [127.0.0.1]:47366 D=0s closed by QUIT
    2024-10-08 21:54:58 SMTP connection from [212.227.126.133]:49713 (TCP/IP connection count = 1)
    2024-10-08 21:55:40 H=mout.kundenserver.de [212.227.126.133]:49713 X=TLS1.3:TLS_AES_256_GCM_SHA384:256 CV=no F=<grupovdt@grupovdt.net> temporarily rejected RCPT <infoutiel@xxxx.com>: Deferred due to greylisting. Host: '212.227.126.133' From: 'grupovdt@grupovdt.net' To: 'infoutiel@xxxx.com' SPF: 'unchecked'
    2024-10-08 21:55:40 SMTP connection from mout.kundenserver.de [212.227.126.133]:49713 D=41s closed by QUIT

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  • cPRex Jurassic Moderator

    Thanks for the additional details.  These look like normal log entries due to the cPanel Greylisting system:

    https://docs.cpanel.net/whm/email/greylisting/

    This helps prevent spam and automated emails by ensuring the sending mailserver tries to send the message again, which is something that will not happen from automated spam bots.  This log doesn't indicate a problem with the mailserver or a failed delivery.

     

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  • Kennybe

    Problems are still ongoing ...

    Uw bericht heeft enkele of alle geadresseerden niet bereikt.

          Onderwerp:        RE: Aanvraag fietsbeugel RVS

          Verzonden:        9/10/2024 16:45

    De volgende geadresseerde(n) zijn niet bereikt:

          'redacted@domain.com' op 9/10/2024 16:46

                Serverfout: 451 Temporary local problem - please try later

     

     

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  • cPRex Jurassic Moderator

    Kennybe - this is an outbound message, so it seems like your mails are being limited by the host as outlined here:

    https://support.cpanel.net/hc/en-us/articles/1500010561081-Email-451-Temporary-Local-Problem-Host-is-ratelimited

    If that's the case, there likely isn't anything you can do except wait, as the error isn't on the cPanel side of things.

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  • Kennybe

    Moved the account to another server ... problem solved...

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