Mail validation checking PLEASE HELP

[rajmohan]

I want a php or Javascript coding for mail validation

it is posible to check the email id is correct or not ?

Example
if i enter the below one
[b][email protected] [/b] It should not accept this one because there is no mail like this, is there any coding for that this one please help me

[ToonMariner]

Not t home at the moment but I do have a script that actually connects to the named server and checks if that e-mail address is valid.

The script will detect if an e-mail definitely does not exist BUT will not detect such if the server has a catch all e-mail for the account. That is if an email comes in that is NOt on the list it will be delivered to the catchall account and would return true in terms of validity of that address.