Probing Email Addresses For Validation

[Nate1]

I have a form which excepts User Details, including Emails, for company Enquiries, Currently I validate the Email address with a Regular Expression which is good stops some problems, though there are alot of Email not being Delivered messages coming through, Still need to check the mail server, though made me think that If during the forms validation I could probe the Email address, send a small email, or just enough to get (Is it TCP/IP) confirmation of receiver, then validate the form?

How can this be Done?

[chazzy]

most people use a regex validation, it works fine. other than that, you could use a DNS check to see if the domain itself is valid.