Validating email id
If it all works, you can continously monitor your address list to ensure email addresses continue to be valid - Some mail servers may return a positive response even if the mailbox doesn’t exist.Just an FYI: I'm the author of Mime Kit which has already been mentioned on this thread.
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Text)) The regex classes are located in the namespace System.
To make them available, place at the start of your source code.
I validate the email address at the client side by using the Regular Expression validator.
Then in the code behind I write the code to send the mail and I am sending synchronous mail (which actually responds when mail is received at the receiver end).