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cPanel Technical Support has been heavily impacted by hurricane Beryl and our ability to respond to tickets has been hindered as a result. We appreciate your understanding and patience as we address these delays.

SMTP Very Slow

Comments

7 comments

  • JaredR.
    Since this happened after the 11.52 update, please submit a ticket using the link in my signature so we can take a look at it. You can post the ticket number here so we can follow up.
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  • TCB13
    Hello, The id is 7169285. Thank you.
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  • TCB13
    As pointed by the support, this issue was caused by having the following option turn on: - Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam. The SMTP receiver will wait a few additional seconds for a connection when it detects spam messages in order to reduce inbound spam. The system excludes the following remote hosts from the delay: Neighbor IP addresses in the same netblock, Loopback addresses, Trusted Mail Hosts, Relay Hosts, Backup MX Hosts, Skip SMTP Checks Host, Sender Verify Bypass Hosts, and Greylist Trusted Hosts.
    This can be disabled from Home "Service Configuration "Exim Configuration Manager in the basic editor. Thanks for all!
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  • cPanelMichael
    Hello :) This is documented at:
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  • Glen Schaefer
    i had exactly the same issue after upgrading to to WHM 11.52.0. I disabled the exim SMTP delay option and everything worked fine. Was getting a 15 sec timeout before that. Am very happy to have found this forum !!! Thank you :)
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  • autumnwalker123
    Would this apply to applications on the server sending via SMTP as well? I have noticed a slow SMTP issue via apps like Invision Power Board. Issue is fixed by using external SMTP (e.g. Mandrill).
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  • cPanelMichael
    Would this apply to applications on the server sending via SMTP as well? I have noticed a slow SMTP issue via apps like Invision Power Board. Issue is fixed by using external SMTP (e.g. Mandrill).

    This option is utilized for incoming email. It would not cause slowness for outgoing email. You should open a new thread if you would like us to help you to troubleshoot an issue with outgoing email. Thank you.
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