JavaMail and Valid Email Address

Hello All,
I am using JavaMail API to send thousands of emails every day through my application running on J2EE application server...
But what i really want to do is, how do i check whether a particular Email Address is Valid or not,if not valid then catch a exception and report it....
Also i meant by Valid email address as to be exsisting on that mail server..e.g "[email protected]"...i.e.the user "javamail" should exist on that domain "sun.com"...
Is there any way which i can do the above thing?
Also,since i will be sending 1000's of emails every day will it be feasible for me to check each and every email whether it exist or not and then send it.....how much time will it take to do the same...
Please help me out with this,can anybody give me a Detail desciption and Code of how can i do it...
Any suggestions are greatly appreciated
Thanks a million is advance
Sam

E-mail generally passes through a whole series of Mail Transfer Agents before arriving on the target machine, and it could be rejected at any stage.
It may wind up waiting in a queue. It could be days before it reaches a machine that knows whether the user is valid or not.
And machines aren't as helpful as they used to be about letting out information about available e-mail addresses,
too many evil spammers about.
You can test the format, though I've seen a lot of active e-mail addresses with what I believe are invalid characters in them apparently find their way through.
In theory you could look up the domain part of the address on the DNS. If you don't find either an "A" record or a "MX" record then niether will your mail transfer agent. AFAIK there's no standard java classes for doing that but there may be some out there on the net.
There's no sure way of validating a user name except sending a mail and see if it bounces.

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    Murray --- ICQ 71997575
    Adobe Community Expert
    (If you *MUST* email me, don't LAUGH when you do so!)
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