It depends on what access you have: I use Net::POP3 quite successfully to process mail programmatically. If the mailboxes aren't fronted by a POP3 server, it would be of no use, though.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
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<sub> <sup> <table>
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Snippets of code should be wrapped in
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tags should generally be avoided. If they must
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Want more info? How to link
or How to display code and escape characters
are good places to start.