I agree with the suggestions to use a ready-made regexp. But if for some reason I had to reinvent one, I'd extend the \w token as much as necessary rather than go from scratch, something like...
$spammer = length($f{'Email'})
  && $f{'Email'} !~ /^(^\w|\-|\.)+\@(\w|\-|\.)+$/;

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-M

Free your mind

In reply to Re: regexp to only allow for formally valid email addresses by Moron
in thread regexp to only allow for formally valid email addresses by fraktalisman

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