Verify an e-mail-adress - syntax and dns

[Marc 'BlackJack' Rintsch]

In <ef5nop$aoh$1 at news01.versatel.de>, Ingo Linkweiler wrote:

> The script will be used as part auf a user registration page to avoid 
> dummy-inputs like "jsfhsadgfa at hdhjdfhjh.net"

The usual way to cope with this is sending out confirmation mails.  No
need to check if the address is syntactically correct beforehand.

Ciao,
	Marc 'BlackJack' Rintsch