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I installed Postfix with ubuntu 9.10, apache2 and php5. I have an e-commerce website that sends out emails using the postfix installed on the server. Do I need to perform any special configuration on postfix to ensure out-going mail with sensitive information is secure?

I installed Postfix with the command

sudo apt-get install postfix

The PHP mail() function worked immediately afterwards, so I did not modify postfix's default configuration. Do I need to do more for security?

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There is a similar question with an answer providing other good hints. – lumbric Jan 1 '12 at 22:57
up vote 0 down vote accepted

You must always check the configuration of the MTA. Anyway, if you bind Postfix only to with inet_interfaces parameter, you can be quite sure, but never rely on defaults.

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