> Yes, inbound. I'm wondering why there are so many mails to not-existing 
> recipients.
> Anything more than 5% bad recipients in mail sent by a given IP address will 
> land you in hot water with ... certain ISPs. 😊

Here's the explanation I give when I have to explain why high hard bounce rate 
= bad: once upon a time, spammers thought that maybe they'll manage to reach an 
existing email address if they tried to contact every combination of accepted 
characters in the user part of email addresses. Starting with a@, aa@, aaa@ to 
zzzzzzzzzzzzzzzzz@, with numbers or without. At some point they thought that 
using a dictionary of firstnames and/or lastnames could spare some time, as a 
lot of email addresses are built this way.
That was spam.
That generated a lot of hard bounces.
Receivers started to consider that lot of hard bounces = spam.


From: mailop [mailto:mailop-boun...@mailop.org] On Behalf Of Michael Wise via 
Sent: Saturday, 3 February, 2018 04:29
To: ComKal Networks <ad...@comkal.com.au>; mailop@mailop.org
Subject: Re: [mailop] Invalid address ratio?

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<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ?

-----Original Message-----
From: mailop <mailop-boun...@mailop.org<mailto:mailop-boun...@mailop.org>> On 
Behalf Of ComKal Networks
Sent: Friday, February 2, 2018 9:02 AM
To: mailop@mailop.org<mailto: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 

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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