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SMTP Very Slow

Discussion in 'E-mail Discussion' started by TCB13, Sep 24, 2015.

  1. TCB13

    TCB13 Well-Known Member

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    Hello,

    After the upgrade to WHM 11.52.0 (build 5) I noticed a strange thing. My STMP is very very slow. When a email client like Outlook or even RoundCube Webmail tries to send email, it takes about 30s or more for the email to be sent.

    What going on? How can I track this issue? What can I do?

    Anyway the server load is very low:
    cdn.iklive.eu/tcb13/2015/cpanel-server-load-smtp-post.png

    Thanks!
     
    #1 TCB13, Sep 24, 2015
    Last edited by a moderator: Sep 24, 2015
  2. cPanelJared

    cPanelJared Technical Analyst

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    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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  3. TCB13

    TCB13 Well-Known Member

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    Hello,

    The id is 7169285. Thank you.
     
  4. TCB13

    TCB13 Well-Known Member

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    As pointed by the support, this issue was caused by having the following option turn on:

    This can be disabled from Home »Service Configuration »Exim Configuration Manager in the basic editor.

    Thanks for all!
     
  5. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    This is documented at:

    11.52 Release Notes - Delay SMTP transaction for incoming spam

    Per the document, this option configures the SMTP receiver to wait a few additional seconds for a connection when it detects spam messages. Disabling the option is likely to increase the amount of SPAM received on your system.

    Thank you.
     
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  6. Glen Schaefer

    Glen Schaefer Registered

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    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 :)
     
  7. autumnwalker123

    autumnwalker123 Active Member

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    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).
     
  8. cPanelMichael

    cPanelMichael Forums Analyst
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    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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