>Does anyone know how to check for the validity of email addresses beyound the simple check for one @ and one . ?
>
>Domain and/or domain+account checks???

Regarding syntax check, you can look at Thread #557301 Message #557408.

A valid domain name does not imply a valid mail server: a great number of host names (that reply positively to DNS checks) don't have mail servers attached. I think no service will be able to assure a working account@server, but I may be proven wrong.