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by TomatoTomato 5020 days ago
What about just checking if a MX record exists?
1 comments
kingatomic 5020 days ago
That verifies the domain, but not the actual mailbox.

One possibility would be to lookup the MX, then connect to the remote MTA and ask it directly if the mailbox is valid. But that seems a bit like over-engineering.

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ars 5020 days ago
It's also possible that the email server is down at the moment, but will come back up later.
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