On 2023-12-16 at 11:31:18 UTC-0500 (Sat, 16 Dec 2023 17:31:18 +0100) Thomas Walter via mailop <b...@fh-muenster.de> is rumored to have said:
> 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. That's not tenable in the modern world. > Now that you said it, I'm going to suggest to the user to just alias > individual addresses instead of the catchall. Another alternative that is available in Postfix would be to accept certain patterns (i.e. a regexp or pcre table) and not others, such that the user could create arbitrary addresses within the accepted patterns, which preferably are not matched by the delusions of random spammers > I still think Microsoft should not complain about NDRs, especially if the > original was from them. NDRs have become taboo over the past ~25 years. The sound reasons for generating them for non-deliverable mail from the world at large have been overwhelmed by the nuisance of "backscatter" from systems that accept-then-bounce bogus local addresses without doing an adequate job of authenticating the original envelope sender (which is not possible to do reliably.) But yes: it is useless for MS (or anyone else) to complain about backscatter. It's far more efficient to just stop accepting mail from backscatter sources and wait for complaints. A large fraction of such systems never handle a legitimate message for the domains to which they send their garbage. -- Bill Cole b...@scconsult.com or billc...@apache.org (AKA @grumpybozo and many *@billmail.scconsult.com addresses) Not Currently Available For Hire
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