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theFez:
While I would agree with you, this doesn't always seem to be the case in modern times. Before the advent of UCE, contacting the server to determine the definitive existence of a mailbox would work wonders for mail submission forms.
Nowadays, most SMTP servers (or rather, servers that are intelligently implemented) will tell the contacting application that the address does in fact exist (or not) and only then decide whether to actually act on the new mail message or not (depending on the innards of said SMTP server).
I wouldn't rely on that now (although I have in the past with much success). A good regular expression match will do the trick. A connection, as well as the contacted server sending the UCE to /dev/null is probably cheaper.
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"You looked at me as if I was eating runny eggs in slow motion." - Gord Downie of The Tragically Hip
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