Hello Richard, On 16.12.23 18:12, Richard via mailop wrote:
Your approach is generating backscatter spam (to hotmail, where the mail may not even have originated - the "From:" address is likely forged so your assumption that it originated from hotmail could well be wrong), which (being polite) is not considered a good thing. You need to reject the mail on the originating connection, rather than bouncing after acceptance. [you could consider tossing non-deliverable messages rather than bouncing them, but you could end up junking "legit" non-deliverables.]
I wouldn't have mailed here if I hadn't checked the source first.Dec 15 20:46:06 speedy postfix/smtpd[64567]: ACC2D1FF9B: client=mail-westus2azolkn19012032.outbound.protection.outlook.com[52.103.10.32] Dec 15 20:46:06 speedy postfix/cleanup[64616]: ACC2D1FF9B: message-id=<by5pr05mb70767630cbb6cd78ea45ce3cc4...@by5pr05mb7076.namprd05.prod.outlook.com> Dec 15 20:46:08 speedy postfix/qmgr[6907]: ACC2D1FF9B: from=<[email protected]>, size=9557, nrcpt=1 (queue active)
Backscatter spam *will* get you on blocklists.
It was used as fallback for domains that have not been active for more than 5 years. We advise customers against using catchall and forwarding addresses, but…
We've also set up recipient address verification in Postfix - which I know comes with its own problems - to try to keep these low.
I am actually not sure why Postfix didn't catch this one which is completely handled locally.
Regards, Thomas Walter -- Thomas Walter Datenverarbeitungszentrale FH Münster - University of Applied Sciences - Corrensstr. 25, Raum B 112 48149 Münster Tel: +49 251 83 64 908 Fax: +49 251 83 64 910 www.fh-muenster.de/dvz/
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