validate email address in domain using asp.net

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plz help me to validate email address in domain ...
for example i want to check the email address like xyz@yahoo.com exists or not...
for gmail,rediff,hotmail etc etc....

Posted 10-Dec-12 5:47am

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Thomas Daniels · Answer 1 · 2012-12-10T06:13:00

The best way to check this, is to send a confirmation email within a code. You ask the user to enter the code in a text box and then you can check whether the sent code is equal to the entered code.
To send an email:
Sending an Email in C# with or without attachments: generic routine.[^]
VB.NET tip:
Sending an Email in C# with or without attachments: generic routine.[^]

ashokmmrk · Answer 2 · 2012-12-10T06:29:00

Solution 2

Hi,

Try this

<asp:regularexpressionvalidator id="regexEmailValid" runat="server" validationexpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" controltovalidate="tbEmail" errormessage="Invalid Email Format" xmlns:asp="#unknown">

Posted 10-Dec-12 6:29am

ashokmmrk

Comments

Thomas Daniels 10-Dec-12 12:38pm

This isn't what the OP asks. The OP asks how to check whether an email address does exist.
Your answer checks whether the entered email address is in a valid format.

ashokmmrk 10-Dec-12 13:02pm

Please, Once Again read this

for example i want to check the email address like xyz@yahoo.com exists or not...

He clearly mention that Email address like xyz@yahoo.com exists or not...

Zaf Khan 10-Dec-12 23:10pm

I agree with ProgramFox, The best way to see if an email EXISTS is to send an email to to the address - taking for granted that the FORMAT of the email address is correct.

The best way to VALIDATE if an email is FORMATTED correct is probably the way ashokmmrk says.