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verification of existence of email id

Dinesh Babu
Greenhorn

Joined: Jan 24, 2002
Posts: 1
Hi all,
Could any one of u pl suggest a way to verify the existence of an e mail Id using java code.

Thanks
Dinesh Babu.


Thanks and rgds
Jeroen Wenting
Ranch Hand

Joined: Oct 12, 2000
Posts: 5093
You can check if it is a VALID email address by checking it against the corresponding RFC.
This mainly means there must be an @-sign somewhere in there with something in front and behind.
Then you could try a DNS lookup of the part after the @-sign. If that doesn't exist it's pointing to a non-existing domain and would therefore never arrive (not quite sure here, it is possible that for example dummy.somisp.sometld would arrive is only somisp.sometld is a valid DNS entry).
The part in front of the @-sign you can only determine the validity of by actually trying to send to the address. If you get a bounce (which may take a long time to arrive, some mailservers try repeatedly for a day or more to deliver in case a client address is only temporarilly unavailable) the address certainly does not exist.
If you get no bounce someone has received your message, but that may well be a blacklist and no recipient will ever read it.


42
Ernest Friedman-Hill
author and iconoclast
Marshal

Joined: Jul 08, 2003
Posts: 24184
    
  34

Hi,
Welcome to JavaRanch!
The SMTP standard includes a "VRFY" command which you used to be able to use to verify whether an email address was valid at a particular host. Nowadays, virtually all sites implement this as a no-op, so it's pretty much useless.
The only way that works is to send an email to the address containing a unique URL. The email should instruct the recipient to visit the URL. A servlet at the URL can then record that the corresponding email is valid.


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