You headed your posting with "Email Load", and then spoke about mails not from you, and failures.
I am not clear what it is that is bothering you.
There is no load on your outgoing mail server, because the mails don't come from you.
Incoming, it shouldn't be a problem for your mail server, but your server will have to receive them to examine them.
You could automatically delete all emails that are not to your real address(es).
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