SMTP Warnings - Mxtoolbox

TDAndy

• March 19, 2017 00:40

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

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  sktest123

  • March 19, 2017 11:55

  Please refer below threads, definitely you will gain solutions Warning - Reverse DNS does not match SMTP Banner Reverse DNS does not match SMTP Banner

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  TDAndy

  • March 19, 2017 12:01

  Please refer below threads, definitely you will gain solutions Warning - Reverse DNS does not match SMTP Banner Reverse DNS does not match SMTP Banner

  
  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

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  ChrisI

  • March 21, 2017 17:09

  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!

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  TDAndy

  • March 26, 2017 09:22

  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

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  cPanelMichael

  • March 27, 2017 15:59

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

  
  Yes, it's a good idea to leave the option enabled.

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

  
  SMTP TLS is supported. This is discussed on the following post: Warning: No server certificate defined; TLS connections will fail.

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

  
  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.

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