Which blacklist was it and how much did they charge? I have always wondered which are more mafia-esque and which less, as they all act so innocent but are also so adamant about hiding their pricing.
The fix is to configure your MTA so that it doesn't send backscatter
Alternatively attempt to send a message to a nonexistent address on your MTA using telnet which should throw an error after "RCPT TO" if the server is configured correctly Steps to test SMTP via telnet: https://my.esecuredata.com/index.php?/knowledgebase/article/...
My understanding was that a backscatter uses an email that is not his, in order to deliver a message without sending it directly (and making the bounce server act like a spammer).
Am I missing something?
[1] https://willem.com/blog/2019-09-10_fighting-backscatter-spam...