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Is it possible to change IP address for outgoing mail in Postfix without changing MX records?

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Taras Ermoshin
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Plesk Onyx 17.5 for Linux kb: how-to ABT: Group B

Applicable to:

  • Plesk Onyx 17.5 for Linux

Question

Is it possible to change IP address for outgoing mail in Postfix without changing MX records?

Answer

When in Tools & Settings > Mail Server Settings the option Outgoing mail mode is set to Send from the specified IP addresses , MX records are updated along with the Postfix configuration because of SPF.

If just change smtp_bind_address parameter in the /etc/postfix/main.cf file, but MX records contain the old IP address, there will be difficulties with the outgoing mail delivery from a Plesk server - SPF check will be failed on the receiving end due to different IP addresses in the MX and SPF records.

The smtp_bind_address parameter can be changed manually in the /etc/postfix/main.cf file, but at your own risk - this change will be rewritten by Plesk when changing Tools & Settings > Mail Server Settings > Outgoing mail mode , and the difficulties mentioned above will occur.

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