The easiest method to see a full version of the files with proper syntax is to temporarily enable the following "automatic" option:
WHM: Main >> Service Configuration >> Exim Configuration Editor >> Standard Options >> Domains and IPs
* Automatically send outgoing mail from the account's IP address instead of the main IP address. Warning: If you turn this setting on you should make sure reverse DNS entries match the ones in /etc/mail_reverse_dns
The above option will create the files so you can simply view their contents to see how they are used.
Alternatively, you can manually create them based off the following examples, while being sure to use your own domains and IP addresses where applicable; however, please note that to retain customizations of the two files, mailhelo and mailips, it is necessary to enable the relevant options via the Exim Configuration Editor in WHM as seen below.
WHM: Main >> Service Configuration >> Exim Configuration Editor >> Standard Options >> Domains and IPs
* Send HELO based on the domain name in /etc/mailhelo (*: HELONAME can be added to the file to change the default helo name)
* Send outgoing mail from the ip that matches the domain name in /etc/mailips (*: IP can be added to the file to change the main outgoing interface)
Full Path: "/etc/mailhelo"
Code:
domain2.tld: domain2.tld sub.domain2.tld: domain2.tld addondomain.tld: domain2.tld other.domain3.tld: other.domain3.tld *: server1.domain1.tld
The "#.#.#.#" entries in the following two examples are meant to represent IP addresses on your system; be sure to use only valid, public IP addresses that are accessible via the Internet.
Full Path: "/etc/mailips"
Code:
domain2.tld: #.#.#.2 sub.domain2.tld: #.#.#.2 addondomain.tld: #.#.#.2 other.domain3.tld: #.#.#.3 *: #.#.#.1
You should not have to manually edit or manage the mail_reverse_dns file; the only two that you would manually edit are mailhelo and mailips. For the sake of showing an example, though, here is what the mail_reverse_dns file might look like:
Full Path: "/etc/mail_reverse_dns"
Code:
#.#.#.1: server1.domain1.tld #.#.#.2: domain2.tld #.#.#.3: other.domain3.tld
1.) "domain2.tld" is a primary domain
2.) "sub.domain2.tld" is a sub-domain of "domain2.tld"
3.) "addondomain.tld" is an add-on domain of "domain2.tld"
4.) "other.domain3.tld" is a also primary domain
5.) "server1.domain1.tld" is the server hostname
If you opt to manually create, update and manage the mailhelo and mailips files, you are free to customize them as needed provided they contain the correct syntax and use only valid domains and IP addresses.
