Rather than implementing an anti-spam filter yourself, have you looked at the fine selection of modules on CPAN?

Mail::Audit and Mail::SpamAssassin make an extremely flexible and easy to use mail filtering toolset.

Have a look at the various Mail:: modules for all your filtering needs.

Cheers.

BazB

If the information in this post is inaccurate, or just plain wrong, don't just downvote - please post explaining what's wrong.
That way everyone learns.

In reply to Re: Email suffix matching with a negative look-ahead regexp by BazB
in thread Email suffix matching with a negative look-ahead regexp by jxz

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