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postconf -d | grep message_size_limit


message_size_limit = 10240000

This limit was not set in /etc/postfix/ so I assume its a default?

I added message_size_limit = 31457280 to my /etc/postfix/ and restarted postfix. But I still get message_size_limit = 10240000 from postconf -d | grep message_size_limit. It's not accepting my change. why?

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Try do hard reload using /etc/init.d.postfix stop ; /etc/init.d/postfix start. You can try to check, if postfix use the same config file by postconf | grep config_directory – Jan Marek Dec 27 '12 at 21:43
The config directory is correct, stopping and starting manually has no change (its service postfix stop on this system), no errors in mail log. – Nick Dec 27 '12 at 21:46
up vote 3 down vote accepted

From the man postconf:

-d    Print default parameter settings instead of actual settings.

You have do not use -d parameter in the invocation of postconf utility.

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In other words, I'm an idiot. – Nick Dec 27 '12 at 21:58
No, but sometimes people don't see everythink, me is one of them. – Jan Marek Dec 28 '12 at 9:23

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