> I'm a bit surprised, that on a small mail server, 77 % of the rejected
> mails are rejected because of invalid recipient adresses. 22 % because
> of DNSBL.

> Is this ratio normal?

There abouts, email is free, for a certain class, so adding a lot
of names to the left of the @ is very old school but also
a lot of the scrappers end up with all those weird usernames
like 4ffb8ac-a0a-3cc0-e87c-65a3df124...@example.net
that appear in email headers as part of references in mailing
lists etc.

The ratio does vary depending on age and usage a domain
has had so I'm serious when I say it could vary as much
as +10 -50%.



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