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Tweak Site Settings

This form is used to tweak some settings of the site, which is sometimes needed to work around server bugs or environment problems. Currently, only some email parameters can be modified from this page. It is recommended that you do not mess with these settings unless you know what you are doing, see the documentation.

Separate header lines by "\r\n" or by "\n".
The default is "\r\n". Change it only if you know that the server has a bug in the way it handles email headers.
Send header line "X-Mailer: PHP/version" with each message.
Sending this header line is considered standard net etiquette, but some spam-filters out there mark as spam anything that has this header line. UNcheck this box if this causes email loss.
Specify the Sender: (suggested name: admin@localhost).
If you know how the web-server is calling itself on email messages that it sends, you can specify it here. This is often something like userName@machineName where userName is the username of the web-server (e.g., www, apache, admin, etc.) and machineName is either the DNS name of the machine (e.g., www.mit.edu) or sometimes just localhost.

Explanation: When the web-server sends email, the name of the web-server itself is set as the "envelope sender" of this message. It was observed that some ISPs filter as spam email messages where the From: header line does not match the "envelope sender". Hopefully specifying a matching "Sender:" line would prevent these emails from being discarded.
Specify the "envelope sender" in the mail function.
Sometimes you can explicitly specify the "envelope sender" to be used, by supplying the parameter "-f name-to-use" to the PHP mail function. This only works on (some) Unix systems, and does not work when PHP is in "safe mode". Also, using this option typically adds an "X-Warning:" header line to the message, which can again increase the odds of this message being discarded en-route.

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