in reply to preventing malicious mail attacks

Take a look at Email::Valid and friends. You'll be glad you did.

Peter L. Berghold -- Unix Professional
Peter at Berghold dot Net
   Dog trainer, dog agility exhibitor, brewer of fine Belgian style ales. Happiness is a warm, tired, contented dog curled up at your side and a good Belgian ale in your chalice.

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In Section Seekers of Perl Wisdom