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I'm trying to change the source IP of my mailing server from IPv6 to IPv4.

I'm running Debian 6.0.7 with Postfix 2.7.1 mail service and ISPConfig

I found lots of forums saying that is easy as change the parameter smtp_address_preference = any to smtp_address_preference = ipv4 in /etc/postfix/ config file, but I can't find this parameter in that file, and if I run postconf smtp_address_preference command it prompts smtp_address_preference: unknown parameter.

I tried adding it and reloading the service with no luck... Can anyone tell me what I'm doing bad?


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closed as off-topic by HopelessN00b Mar 8 '15 at 18:51

  • This question does not appear to be about server, networking, or related infrastructure administration within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

up vote 0 down vote accepted

smtp_address_preference was a part of the 2.8 update

you should look into: inet_protocols = ipv4

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