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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 3.0.5.1.

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/main.cf 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?

Thanks!

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1 Answer

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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