Exim banner, mail headers and resellers with own ip

What is your cPanel version number? If needed, this can be found in the upper-right corner of WebHost Manager (WHM) or obtained via root CLI/SSH access as seen below:

Code:

# /usr/local/cpanel/cpanel -V

Please provide the output from the following command:

Code:

# grep per_domain_mailips /etc/exim.conf.localopts && stat /var/cpanel/per_domain_mailips

 

The information provided leads me to believe that the option that will automatically manage the files /etc/mailhelo and /etc/mailips is not enabled via the Exim Configuration Editor in WHM. Are one or both of the other (non-automatic) options enabled to allow the two files to be managed manually?

Providing output from the following command will help to confirm which options may be enabled:

Code:

# egrep -Hn "(custom_mailhelo|custom_mailips|per_domain_mailips)" /etc/exim.conf.localopts && stat /var/cpanel/custom_mailhelo /var/cpanel/custom_mailips /var/cpanel/per_domain_mailips

Related menu path and documentation:

• WHM: Main >> Service Configuration >> Exim Configuration Editor >> Domains and IPs
• Changing the Sending IP for Outbound Email in Exim

 

I apologize. I misunderstood the circumstances, and I confirm what you have described. I would believe it is normal for the hostname to be used in the smtp_banner. To help me better understand the difficulty, please elaborate in detail about the specific problem that you are encountering.

 

I tried reproducing the message reported at the mxtoolbox web site, but I was unable to trigger the same message. The following is munged output using the "SMTP" test at th mxtoolbox web site:

Code:

220-server1.domain.tld ESMTP Exim 4.69 #1 Fri, 24 Dec 2010 21:58:57 -0600 We do not authorize the use of this system to transport unsolicited, and/or bulk e-mail.

Not an open relay.
 0 seconds - Good on Connection time
 2.527 seconds - Good on Transaction time
 OK - 1.2.3.4 resolves to n4.3-2-1.domain.tld
 OK - Reverse DNS matches SMTP Banner

I performed the test using the primary domain of a cPanel account that is assigned to a dedicated IP address, different from the main server IP address. The reverse DNS (PTR) record of the account-specific dedicated IP address is not the same as the account domain name nor the server hostname, yet the mxtoolbox web site reports that "Reverse DNS matches SMTP Banner."

The test results lead me to believe that the reverse DNS being compared to the SMTP banner is the actual PTR record of the hostname in the SMTP banner and not the reverse DNS of the unique, dedicated IP address that happens to be used by a hosted cPanel account.

What problem is addressed by changing the existing Exim behavior? Where does this need originate? I ask because I am not aware of any reason why e-mails would be rejected when the SMTP banner correctly reports a hostname that has matching PTR record for its IP address when the connection uses a different IP address, which has its own unique PTR record that is different than the cPanel account domain name.

If the SMTP banner matches only the PTR record of the IP address used in the connection, how does this affect or help add-on and parked domains that share the same IP address as the account primary domain name?

 

To retain custom modifications made outside of the Advanced Exim Configuration Editor in WHM, I recommend using the built-in pre and post script hooks that can be used to automatically execute a custom script or other shell commands to re-apply specific customizations (e.g., via a custom patch to exim.conf):

Code:

/scripts/prebuildeximconf
/scripts/postbuildeximconf

Related documentation:

• Hooking into cPanel Functionality
• cPanel & WHM Script Hooks