[BlueOnyx:22831] Re: Backscatter

[Ken Hohhof]

If there is no such user on your system, the email should be rejected during the SMTP connection, which would not result in a bounce message to the spoofed sender.

 

Unless the spammer is actually sending from that sender’s mailserver using compromised credentials.  In which case you’re not really causing backscatter.

 

From: Blueonyx <blueonyx-bounces at mail.blueonyx.it> On Behalf Of Colin Jack
Sent: Thursday, April 18, 2019 1:30 PM
To: BlueOnyx General Mailing List <blueonyx at mail.blueonyx.it>
Subject: [BlueOnyx:22830] Backscatter

 

I know this is an old chestnut and I have tried to find solutions without success.

 

The problem is that we have long deleted email accounts on our servers that are still listed on the mega spam address lists.

So spam pours in – AV-Spam grabs some but lots still get through. An NDR then gets sent back to the poor b* whose email address is in the reply to.

Net result is we get listed as a backscatterer on RBLs. ☹

 

What is the suggested way forward on this?

 

Colin

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