On 16.12.23 12:11, ml+mailop--- via mailop wrote:
On Sat, Dec 16, 2023, Thomas Walter via mailop wrote:2. Our server bounces with 550 5.1.1 User doesn't exist.Does your server generate a DSN? If the "User doesn't exist" then it seems you should be able to determine that fact when RCPT is given -- or is this just a bogus reply?
It's a catchall forwarded domain "@olddomain -> @newdomain", so Postfix accepted it before checking the final recipient.
Now that you said it, I'm going to suggest to the user to just alias individual addresses instead of the catchall.
I still think Microsoft should not complain about NDRs, especially if the original was from them.
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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