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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).
But this takes time, so If mail has to be sent to many, then use asynchronous mails.
That said, I would not recommend the use of Mime Kit for simply validating an email address (it's way overkill).
Email address validation can be tricky at the best of times and with international domain names in email addresses, almost anything is possible.
In my opinion, there is no 100% reliable way of validating email addresses, you just have to make sure that it conforms to as reasonable a standard as possible.
When we built our validator, we did so based on real-world data RFC spec to ensure more accurate validation.
All major mailbox providers have their own custom grammar rules that impact whether an email address is valid in the real world.