Check the given e-mail ids exists or removed by the service provider

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I have a list(100) of e-mail Ids.like
raj@gmail.com
raja@yahoo.co.in
raj@hotmail.com etc.

By having list like this I need to check this list for every month or every week whether these E-mail Ids exists(alive) or deleted by service provider or not used by the user,or is there account exists like this given E-mail ids.

I need to check this process using ASP.net or C#.

Posted 20-May-11 6:28am

sacraj

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CS2011 · Answer 1 · 2011-05-20T07:45:00

Theoretically I think max you can do is check if email id exists or not. This can be done simply sending a mail to given id and if you get a failure notification means email id is invalid (does not exist) however anything more than this will be really hard to do if you are not an admin.

P.S. beware if you keep sending same mails to different (or same email id) multiple time anti spam engine will ban your IP sooner or later

Sergey Alexandrovich Kryukov · Answer 2 · 2011-05-20T06:43:00

It would be a heaven for spammers. I hope that this is impossible — fortunately for the rest of us.

Well, based on your full access to the server, theoretically you can build some special network service working on the same machine as your mail server working in collaboration with it and delivering this information on requests by trusted users. If you ever decide to do it, your first concern would be security. Massive leaking of e-mail information could be fatal.

—SA

Dave Kreskowiak · Answer 3 · 2011-05-20T07:08:00

Solution 2

Since you have no admin permissions to the target servers, it's impossible to do what you want. There is no way to verify that an arbitrary email account is alive and active, or even exists, on an email server you have no control over.

Posted 20-May-11 7:08am

Dave Kreskowiak

Check the given e-mail ids exists or removed by the service provider

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