<header>Header Checks</header>
The optional header checks table allows email to be redirected based on its headers. Each entry in the table has a POSIX regular expression on the left-hand side, and an action on the right. <p>
The regular expression can be something like :<br>
<tt>/name=[^>]*\.(bat|cmd|exe|com|pif|reg|scr|vb|vbe|vbs)/</tt><br>
to match attachments whose filenames end with extensions signifying potentially dangerous Windows executables. <p>
The action can be like :<br>
<tt>REJECT</tt><br>
to simply reject mail matching the expression, or :<br>
<tt>REDIRECT spam@yourdomain.com</tt><br>
To forward mail to another address. <p>
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