jQuery Forum

The one letter for tld is probably a bug. The characters you list are
legal to the left if the last @ sign.
--
Scott
Iphone says hello.

While technically this is correct, a more restrictive approach might
be preferable because some email services (hotmail for one) will not
send to an email address using anything other than alphanumerics,
dots, hyphens, and underscores.

Right, this is sort of a long debate, which I see pop up on mailing
lists for email servers. In the end, I think you need to go by the
standards.
Just because hotmail breaks the rules, does not mean you want to
punish some other user who does not use hotmail, just because they use
a character in their email address that hotmail does not.

Yep. The goal here is to indicate to the user that he mistyped his
address. For that to work reliably, the validation must accept all
valid addresses, not just those that feel more valid then others.
Jörn