[dba-Tech] Validating Email Addresses

Gustav Brock Gustav at cactus.dk
Mon Mar 31 01:36:53 CDT 2008


Hi Rocky

Not really. 
Some spam filters accept all mail to learn from it, only forwarding (of course) those e-mails not detected as spam and with a valid receiver.
Some mail servers accept all mail but quietly drop e-mails with no valid receiver. This is too prevent spammers from guessing valid accounts by brute force methods (semi random generated account names).

So what you effectively can check is if an e-mail address will not be bounced. Or you can put it this way: If you will be able to deliver an e-mail without but not if it also will reach a receiving account.

Further, some mail servers use gray listing which means that an unknown sender will be asked to try again because the server claims to be busy. It will continue to reply this way for an hour or so. Thus, a custom validating function of yours will have to take this into account

/gustav

>>> rockysmolin at bchacc.com 31-03-2008 06:44 >>>
Dear List:
 
Is there a way to validate an email address without actually sending an
email and waiting for the bounce?  Something akin to pinging an IP address?
 
TIA
 
Rocky
 
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