Anything more than 5% bad recipients in mail sent by a given IP address will 
land you in hot water with ... certain ISPs. 😊

Michael J Wise
Microsoft Corporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Got the Junk Mail Reporting 
Tool<> ?

-----Original Message-----
From: mailop <> On Behalf Of ComKal Networks
Sent: Friday, February 2, 2018 9:02 AM
Subject: Re: [mailop] Invalid address ratio?

> 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<>

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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