to check whether an email id exists or not

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Hi I want to check whether a given email exists or not using .net
i have reffered some codes but most of it leading to some online tools is there any other way of achieving it?

Posted 18-Jun-12 19:19pm

Shashwath7

Updated 18-Jun-12 19:24pm

Prasad_Kulkarni

v2

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Pankaj Nikam 19-Jun-12 1:24am

To what you want to compare? I mean is it your own database you want to compare or you want to validate the email ID that it exists or not in the real world for example aslfjsdakjalfj@asfajslfj.com does not exist anywhere... is it what you want to compare? Please clarify.

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Prasad_Kulkarni · Answer 1 · 2012-06-18T19:27:00

Solution 1

Please refer:
Check if email address really exist or not using c#[^]
This article demonstrate basic technique for checking if particular email is exist or not; using SMTP protocol specifications in RFC 821.

Posted 18-Jun-12 19:27pm

Prasad_Kulkarni

SREENATH GANGA · Answer 2 · 2012-06-19T23:06:00

You May first check the entered email id with the custom validator or regular validator to confirm that whether it is in the correct format or not
then
We have to check whether it is present or not ....This you can do by validating whether a Failure mailer demon is being recieved ...assign some flag for the delivery failure and

one drawback of the above method is you may get a delivery failure due to network issues also try to get the error codes and only if it is input adreess not found ..you can confirm that email is not present ...try to code it up now

Prosan · Answer 3 · 2012-06-18T19:34:00

Solution 2

look these links

This[^]
This[^]
This[^]
This[^]

Posted 18-Jun-12 19:34pm

Prosan

Updated 18-Jun-12 19:40pm

v2

AshishChaudha · Answer 4 · 2012-06-19T23:52:00

According to your question there are two possibilities whether you have to check the existing email id in your own database or in outer world also.

in first case you can check easily by executing a query in your own database.
in second case you can send an email to the respective emailid and send a link to redirect to your own website for confirmation of valid email id. if the user confirms than it is a valid email id else no. and develop a scheduler to delete the invalid email id in fixed days by you.

Note : Make proper validation for your email id so that the chances for failure of delivering email to the respective email id will decrease.

Thanks,
Ashish

to check whether an email id exists or not

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