Having ISPConfig running with postfix and amavis is great. However, when you'd like to have your server as a mass emailing server to mailing lists, this is a bottle-neck.

When checking top on the server I saw amavis taking up a lot of CPU while the mailing were sent.
Since we know those mails are without spam/viruses , it'd be smart to close the amavis in order to gain better cpu performence of the server.

Edit /etc/postfix/main.cf
From:
 receive_override_options = no_address_mappings
 content_filter = amavis:[127.0.0.1]:10024


To:
#receive_override_options = no_address_mappings
#content_filter = amavis:[127.0.0.1]:10024


Restart the postfix
# /etc/init.d/postfix restart

See the following for more reference:

http://serverubuntu.it/postfix-management-tools-commands

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