How to disable ipv6 mail in Server?

I'm not doing ipv6 addressing on my server, and I'd prefer not to get the "No route to host" messages in the mail log for the v6 attempts. I've turned off ipv6 addressing altogether with the "networksetup" command, and did the "usual" thing of setting inet_interfaces to ipv4 in the postfix config file, /Library/Server/Mail/Config/postfix/main.cf. However, when I restart the mail service through the server control panel (or, presumably, on system restart), some part of server is clobbering my change, setting the value of inet_interfaces back to all, thus re-enabling ipv6. You'd think that Server would notice that ipv6 is turned off and adjust itself accordingly, but no such luck, it seems. Or have I missed something? Is there any way to do this? Thanks!

What i would do is trace back the launch daemons. Usually these are under "/Library/LauchDaemons" or "/System/Library/LaunchDaemons".
These plist files tell launchd how to launch certain applications. Usually they trigger shell scripts or a deamon directly. I don't have access to my server at the moment so i cannot look to see which daemon is causing this. Anyways i would search all of the files relating to the server functions and find which one is resetting your network interfaces.
Now there is a possibilty that OS X uses ipv6 internally, and if so turning it off may cause problems. This is similar to how OS X requires good DNS resolution, because OS X uses it's own hostname to communicate with itself. If you have bad DNS resoltution it will slow to a crawl. Keep in mind Apple designed the new server app so that anyone could start a server, and not know anything about ipv6 or ipv4.

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Last edited by nbtrap (2012-07-14 21:59:46)

orbisvicis wrote:see "pam_mail.so" in /etc/pam.d/* and "man pam_mail". You most likely need the nopen argument.
Thank you. I fixed it by changing a line in /etc/pam.d/system-login. Specifically, I changed
session optional pam_mail.so dir=/var/spool/mail standard
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