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

Aloha,
Michael.
--
Michael J Wise
Microsoft Corporation| Spam Analysis
"Your Spam Specimen Has Been Processed."
Got the Junk Mail Reporting 
Tool<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ?



-----Original Message-----
From: mailop <mailop-boun...@mailop.org> On Behalf Of ComKal Networks
Sent: Friday, February 2, 2018 9:02 AM
To: mailop@mailop.org
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 
4ffb8ac-a0a-3cc0-e87c-65a3df124...@example.net<mailto: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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