Again, why aren't you just using Email::Valid?
I have already explained that: http://www.mail-archive.com/beginners%40perl.org/msg62450.html
Faulty reasoning, the modules are available for public download to and if they don't have them they'll know it from the error you output about it informing them its needed and be able to install it quite easily
perl -MCPAN -e 'install Email::Valid;'
The advantages of it far outway the "they don't have to install a module" argument. That's what modules are for! :)
Or you can always include the Email::Valid Module in the public script.
That way they don't have to install the module and you can use solid consistent code.
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