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 Warnings - Mxtoolbox

Discussion in 'E-mail Discussion' started by TDAndy, Mar 19, 2017.

  1. TDAndy

    TDAndy Member

    Joined:
    Apr 5, 2016
    Messages:
    6
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Mangalore, India
    cPanel Access Level:
    Website Owner
    Hello Everyone

    When i check my domains on mxtoolbox.com

    i constantly get these 3 warnings

    smtp MYDOMAIN.com Reverse DNS does not match SMTP Banner.
    smtp MYDOMAIN.com Warning - Does not support TLS.
    smtp MYDOMAIN.com 15.455 seconds - Not good! on Transaction Time.

    when i consulted my sysadmin, he informed me that it is cpanel's way of protection and it is automatic and it is fine nothing to worry. i have no choice but to trust the words of my sysadmin.

    just a thought if that was the case then mxtoolbox.com would ignore the same and not show the warnings.

    i would be glad if someone could help me out here, shed some light and possibly a solution to this problem

    Thanks and Regards
    Andy
     
    #1 TDAndy, Mar 19, 2017
    Last edited by a moderator: Mar 19, 2017
  2. sktest123

    sktest123 Well-Known Member

    Joined:
    Jan 31, 2017
    Messages:
    99
    Likes Received:
    6
    Trophy Points:
    8
    Location:
    kochin
    cPanel Access Level:
    Root Administrator
    #2 sktest123, Mar 19, 2017
    TDAndy likes this.
  3. TDAndy

    TDAndy Member

    Joined:
    Apr 5, 2016
    Messages:
    6
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Mangalore, India
    cPanel Access Level:
    Website Owner

    Thank you very much for your answer, i am a newbie and i have no clue about this, but what i could make out is that it can be fixed but only SMTP banner, but the other 2 warnings TLS and Time is not mentioned anywhere

    Would be glad if you let me know a little more ... and that it can be fixed or it is default by cpanel and it cannot be fixed

    so that i can let my sysadmin know it can be fixed and get it fixed
     
    #3 TDAndy, Mar 19, 2017
  4. cPanelChrisI

    cPanelChrisI Technical Analyst II
    Staff Member

    Joined:
    Mar 24, 2014
    Messages:
    67
    Likes Received:
    11
    Trophy Points:
    83
    cPanel Access Level:
    Root Administrator
    Hello!

    The first error:

    smtp MYDOMAIN.com Reverse DNS does not match SMTP Banner.

    is likely because the server's mailserver isn't responding with the same domain as you are using. You can see what is being returned by connecting to the mailserver with this command, using your domain.

    telnet mydomain.com 25

    If the domain is on the server's shared IP, it will likely return the server's hostname in the banner. If you need the domain to show up instead, you can put the domain on a dedicated IP address, then use the /etc/mailhelo and /etc/mailips to set the banner for exim for that domain.

    On this error:

    smtp MYDOMAIN.com Warning - Does not support TLS.

    You can test that by issuing the EHLO command when connecting to exim. Exim should give the STARTTLS option by default.

    $ telnet cptest1.domain.com 25
    Trying 199.191.58.18...
    Connected to cptest1.domain.com.
    Escape character is '^]'.
    220-test3.domain ESMTP Exim 4.88 #1 Tue, 21 Mar 2017 12:45:36 -0400
    220-We do not authorize the use of this system to transport unsolicited,
    220 and/or bulk e-mail.
    EHLO
    250-test3.domain.com Hello ng2.cptxoffice.net [208.74.121.106]
    250-SIZE 52428800
    250-8BITMIME
    250-PIPELINING
    250-STARTTLS
    250 HELP


    This error:

    smtp MYDOMAIN.com 15.455 seconds - Not good! on Transaction Time.

    is normally caused by the 'Introduce a delay into the SMTP transaction for unknown hosts and messages detected as spam.' option under Exim Configuration Manager. This page talks a little more about that.

    Exim Configuration Manager - Basic Editor - Documentation - cPanel Documentation

    Thanks!
     
    #4 cPanelChrisI, Mar 21, 2017
  5. TDAndy

    TDAndy Member

    Joined:
    Apr 5, 2016
    Messages:
    6
    Likes Received:
    0
    Trophy Points:
    1
    Location:
    Mangalore, India
    cPanel Access Level:
    Website Owner
    Thank you cPanelChrisl for the detailed options

    01. SMTP Banner, yes we use a shared server / Ip ... is there anyway to solve this issue without dedicated ip

    02. TLS - should we fix this or leave it as it is ?

    03. Transaction Time - this option looks good to stop unknown hosts from sending bulk email, so i think we should not fix this

    Regards
    Andy
     
    #5 TDAndy, Mar 26, 2017
  6. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Joined:
    Apr 11, 2011
    Messages:
    45,145
    Likes Received:
    1,932
    Trophy Points:
    363
    cPanel Access Level:
    Root Administrator
    Twitter:
    Yes, it's a good idea to leave the option enabled.

    SMTP TLS is supported. This is discussed on the following post:

    Warning: No server certificate defined; TLS connections will fail.

    It should not result in any actual issues with email delivery, other than the warning message you see on MXToolBox. Your server should deliver email successfully provided you follow the guidelines on the following document:

    How to Keep your Email out of the Spam Folder - cPanel Knowledge Base - cPanel Documentation

    Thank you.
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #6 cPanelMichael, Mar 27, 2017
(You must log in or sign up to post here.)
Loading...
Similar Threads - SMTP Warnings Mxtoolbox
  1. sparek-3

    SMTP Connection - lost while reading message data

    sparek-3, Nov 8, 2018 at 7:17 PM, in forum: E-mail Discussion
    Replies:
    3
    Views:
    75
    cPanelLauren
    Nov 12, 2018 at 8:11 AM
  2. dorkstanner

    Require localhost SMTP auth

    dorkstanner, Oct 24, 2018, in forum: E-mail Discussion
    Replies:
    2
    Views:
    85
    cPanelMichael
    Oct 26, 2018
  3. Mike1

    SMTP error from remote mail server after RCPT TO: 451

    Mike1, Oct 23, 2018, in forum: E-mail Discussion
    Replies:
    3
    Views:
    143
    cPanelLauren
    Oct 25, 2018
  4. wofflin

    Outlook 2013 can't auth smtp

    wofflin, Oct 16, 2018, in forum: E-mail Discussion
    Replies:
    1
    Views:
    100
    cPanelLauren
    Oct 17, 2018
  5. araujonelson

    Email delivery problem with SMTP in a single account

    araujonelson, Oct 11, 2018, in forum: E-mail Discussion
    Replies:
    2
    Views:
    285
    araujonelson
    Oct 11, 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