Multiple Shared and Dedicated IPs

scits

• November 07, 2016 07:21

Hello everyone! I am managing a WHM/Cpanel Server which has multiple shared and dedicated IP addresses. In the EXIM configuration manager I've activated "Send mail from account"s dedicated IP address" as this is a requirement for the dedicated IP addresses. This works fine for the domains on the dedicated IPs, however it also creates an issue for the domains on the shared IPs, since the reverse DNS entry points to the server's main host name. Let's assume the following IP setup: [LIST]

webserver01.domain.com - > 1.1.1.1 (server's main hostname and IP)

1.2.2.2 -> shared IP (reverse DNS points to webserver01.domain.com)

1.3.3.3 -> shared IP (reverse DNS points to webserver01.domain.com)

1.4.4.4 -> dedicated IP for abcxyz.com (reverse DNS points to webserver01.abcxyz.com) If I send out an e-mail from 1.2.2.2, some recipient mail servers reject the mail, due to the fact that the reverse DNS entry points to webserver01.domain.com, which in turn points to 1.1.1.1. As stated above, sending out an e-mail from 1.4.4.4 works without any issues. If I see it correctly, there are two options. Either I change the configuration so that the domains on the shared IP use 1.1.1.1 for the outgoing mail, or I create an A-Record for each shared IP, e.g: webserver01-02.domain.com -> 1.2.2.2 webserver01-03.domain.com -> 1.3.3.3 Then I could point the reverse DNS entries of the shared IPs to the host names above. Would that work? Any thoughts? Many thanks in advance! Kind regards, RS

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  cPanelMichael

  • November 08, 2016 15:34

  Hello, I believe this is the same issue reported on the following thread:

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