If you attempt to send an email to *@example.com
- Your SMTP will check the domain exists.
- Your SMTP server will lookup for a
MXrecord atexample.com. - There is none: Your SMTP will fall back on the
Arecord. The IP is 174.137.125.92 (as of today) - The IANA has registered the domain, but has not set up a SMTP server listening on port 25 on 174.137.125.92.
- Then the behaviour depends on your SMTP. Most servers will send you a warning, and try again later. Eventually (usually in 3 days), the SMTP will discard the message and send you a notification of failure.
Bottom line: It depends on your own configuration. But if IANA set up a server today, they might be able to receive messages you tried to send 3 days ago.
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