Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

SMTP Very Slow

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

  1. TCB13

    TCB13 Well-Known Member

    Joined:
    Jul 25, 2014
    Messages:
    62
    Likes Received:
    1
    Trophy Points:
    8
    cPanel Access Level:
    Root Administrator
    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

    Joined:
    Feb 25, 2010
    Messages:
    1,835
    Likes Received:
    20
    Trophy Points:
    143
    Location:
    Houston, TX
    cPanel Access Level:
    Root Administrator
    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.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #2 cPanelJared, Sep 24, 2015
  3. TCB13

    TCB13 Well-Known Member

    Joined:
    Jul 25, 2014
    Messages:
    62
    Likes Received:
    1
    Trophy Points:
    8
    cPanel Access Level:
    Root Administrator
    Hello,

    The id is 7169285. Thank you.
     
    #3 TCB13, Sep 24, 2015
  4. TCB13

    TCB13 Well-Known Member

    Joined:
    Jul 25, 2014
    Messages:
    62
    Likes Received:
    1
    Trophy Points:
    8
    cPanel Access Level:
    Root Administrator
    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!
     
    #4 TCB13, Sep 24, 2015
  5. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    43,617
    Likes Received:
    1,787
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    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.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #5 cPanelMichael, Sep 29, 2015
  6. Glen Schaefer

    Glen Schaefer Registered

    Joined:
    Nov 24, 2015
    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    SCotts Head, NSW
    cPanel Access Level:
    Root Administrator
    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 :)
     
    #6 Glen Schaefer, Nov 24, 2015
  7. autumnwalker123

    autumnwalker123 Active Member

    Joined:
    Jan 19, 2014
    Messages:
    39
    Likes Received:
    0
    Trophy Points:
    6
    cPanel Access Level:
    Root Administrator
    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).
     
    #7 autumnwalker123, Dec 9, 2015
  8. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    43,617
    Likes Received:
    1,787
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    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.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #8 cPanelMichael, Dec 9, 2015
(You must log in or sign up to post here.)
Loading...
Similar Threads - SMTP Very Slow
  1. uk01

    New Thread OWASP rule set blocking smtp

    uk01, Jun 17, 2018 at 5:40 PM, in forum: Security
    Replies:
    0
    Views:
    27
    uk01
    Jun 17, 2018 at 5:40 PM
  2. vponteras

    Use External SMTP When Sending to Specific Domains

    vponteras, Jun 13, 2018 at 9:54 AM, in forum: E-mail Discussion
    Replies:
    1
    Views:
    37
    cPanelLauren
    Jun 13, 2018 at 11:36 AM
  3. Daniel Yi

    PCI Scan failing on SMTP Service Cleartext Login Permitted

    Daniel Yi, Jun 4, 2018, in forum: E-mail Discussion
    Replies:
    6
    Views:
    79
    cPanelMichael
    Jun 6, 2018
  4. knightmare

    SMTP error from remote mail server

    knightmare, Jun 1, 2018, in forum: E-mail Discussion
    Replies:
    3
    Views:
    160
    cPanelLauren
    Jun 4, 2018
  5. Lillike

    SMTP Relay usage

    Lillike, May 31, 2018, in forum: E-mail Discussion
    Replies:
    13
    Views:
    234
    cPanelLauren
    Jun 5, 2018

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Accept Learn More...
    Dismiss Notice