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!

Reverse DNS does not match SMTP Banner

Discussion in 'E-mail Discussion' started by rogerw, Mar 16, 2016.

  1. rogerw

    rogerw Member

    Joined:
    Feb 21, 2012
    Messages:
    22
    Likes Received:
    4
    Trophy Points:
    53
    cPanel Access Level:
    Website Owner
    Thanks... I've been running into the same issue. The resource being linked to does not resolve the issue, it discusses sending form cPanel accounts each with dedicated IP addresses, that's not quite what we need.

    We need help with a server for example: box1.domain.com <==> 123.456.789 (with appropriate PTR created) - But... When using test tools (like mxtoolbox.com) we get the "SMTP Check Banner" error that says "Reverse DNS does not match SMTP Banner".

    What this means is when a cPanel server is set up, for some reason, an incorrect banner is created (even though there's a PTR and A record for "box.domain.com").

    Any help would be immensely appreciated! :)
    Thanks!
     
    #1 rogerw, Mar 16, 2016
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    44,802
    Likes Received:
    1,895
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    Twitter:
    Hello :)

    Could you verify if the issue persists when temporarily disabling the "Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam" option in "WHM >> Service Configuration >> Exim Configuration Manager >> Basic Editor"? I've seen reports that this option prevents third-party utilities such as MXToolBox from completing a check of the RDNS entry.

    Thank you.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #2 cPanelMichael, Mar 16, 2016
    linux4me2 and Suleiman Boutzamat like this.
  3. rogerw

    rogerw Member

    Joined:
    Feb 21, 2012
    Messages:
    22
    Likes Received:
    4
    Trophy Points:
    53
    cPanel Access Level:
    Website Owner
    Yes! That works! Also found that "Only-verify-recipient" - Click "Edit" and add (to allow mxtoolbox.com testing): pws3.mxtoolbox.com (but leaving "Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam" works as well. That is providing the person "trusts" mxtoolbox.com.

    Thanks cPanelMichael - Muchly appreciated! :)
     
    #3 rogerw, Jun 21, 2016
  4. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    44,802
    Likes Received:
    1,895
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    Twitter:
    I'm happy to see you were able to address the issue. Thank you for updating us with the outcome.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #4 cPanelMichael, Jul 4, 2016
    Suleiman Boutzamat likes this.
  5. i-Strategi

    i-Strategi Member

    Joined:
    Mar 14, 2016
    Messages:
    8
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Denmark
    cPanel Access Level:
    DataCenter Provider
    This saved my life.
     
    #5 i-Strategi, Nov 21, 2016
  6. luiz878

    luiz878 Registered

    Joined:
    Feb 14, 2013
    Messages:
    2
    Likes Received:
    0
    Trophy Points:
    1
    cPanel Access Level:
    Root Administrator
    Michael,

    Taking advantage of this your post I've disabled this message you mentioned above and now resolved part of my issue, but I still have this 3 errors below showing in Mxtoolbox from my IP 107.173.183.51

    SMTP Reverse DNS Mismatch - Reverse DNS does not contain the hostname
    SMTP Banner Check - Reverse DNS does not match SMTP Banner
    SMTP Transaction Time - 5.720 seconds - Warning on Transaction Time

    Can you give me a orientation how to fix it?

    Best Regards

    Luiz Osorio
     
    #6 luiz878, Feb 21, 2017
  7. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    44,802
    Likes Received:
    1,895
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    Twitter:
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #7 cPanelMichael, Feb 21, 2017
(You must log in or sign up to post here.)
Loading...
Similar Threads - Reverse does match
  1. Layth

    SOLVED Reverse DNS does not match SMTP Banner

    Layth, May 17, 2018, in forum: E-mail Discussion
    Replies:
    6
    Views:
    669
    Layth
    May 21, 2018
  2. DennisMidjord

    SOLVED Reverse DNS does not match SMTP Banner

    DennisMidjord, Dec 1, 2017, in forum: E-mail Discussion
    Replies:
    2
    Views:
    5,957
    DennisMidjord
    Dec 5, 2017
  3. mytpanel

    Fixing DMARC & Reverse DNS does not match SMTP Banner

    mytpanel, Nov 4, 2017, in forum: Bind/DNS/Nameserver
    Replies:
    1
    Views:
    1,526
    cPanelMichael
    Nov 6, 2017
  4. Ersel Yıldız

    SOLVED Reverse DNS does not match SMTP Banner (Problem)

    Ersel Yıldız, Mar 22, 2017, in forum: Bind/DNS/Nameserver
    Replies:
    6
    Views:
    8,750
    Ersel Yıldız
    Mar 24, 2017
  5. Rakib Ahmed

    SOLVED Reverse DNS does not contain the hostname

    Rakib Ahmed, Feb 12, 2017, in forum: E-mail Discussion
    Replies:
    4
    Views:
    5,520
    cPanelMichael
    Feb 24, 2017

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