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How to use multiple IP for outgoing email?

Discussion in 'E-mail Discussion' started by Remitur, Jun 14, 2018.

  1. Remitur

    Remitur Active Member

    Jan 17, 2018
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    I have a cpanel server used ad shared email server.
    Some users have their own dedicate IP, but many users (few hundreds) use the main server IP for outgoing email.
    So sometimes happen that the IP goes into blacklist 'cause of a single ser who did something wrong...

    Having the availability of a dozen or so of free IPs, I would like to use all of them for shared service: that's to say, i.e., if I have to available, doing that for outgoing emails all of them are used.
    So, if it happens that one of them goes into BL, I can temporarily remove it from the "pool" of available IPs, and do what's necessary before putting it in use again...

    Is it possible? How?
  2. cPanelMichael

    cPanelMichael Technical Support Community Manager
    Staff Member

    Apr 11, 2011
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    Hello @Remitur,

    We document how to configure the IP address that Exim uses for outgoing emails at:

    How to Configure the Exim Outgoing IP Address - cPanel Knowledge Base - cPanel Documentation

    This will allow you to define a specific IP address for all outgoing emails or for a specific set of domain names. As to your specific request, there's no feature included with cPanel & WHM that will automatically rotate the IP addresses used for sending emails on a regular basis. You would have to develop a custom bash script that uses the instructions on the above document to configure certain IP addresses at set time periods or after certain actions. There's an user-submitted example of how to do this on the following thread, but keep in mind it's unsupported and has not been tested:

    IP rotation

    Thank you.
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  3. dalem

    dalem Well-Known Member

    Oct 24, 2003
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    Although Michael's link may work (never tested) subsequent cpanel updates may break it
    We run a separate stand alone exim mail server as a smart host and it has an IP randomizer that sends out on a different IP for every mail sent.
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