whathappenedtoyourwhitespace? Why are you generating a DSN? If it's for "we decided to reject it later" then it's your delivery pipeline post-postfix.
If it's a "user doesn't exist" I'd probably do a catchall alias per domain which was a pipe to a DSN generator; if you can't reject during the SMTP transaction. You can still reject during the SMTP transaction of course. I haven't thought hard about how to do that phase, if you're the outbound smtp client in postfix and the NEXT hop rejects. We will need to figure that answer out I guess. I'll see what I can write up for it. Bron. On Thu, Jun 25, 2026, at 05:49, Edmund Lodewijks wrote: > Hello all! > > I am trying to implement§12 of spec-03 inPhoenixDKIM(anOpenDKIMfork— > milter pluslibrary),andthe myquestioniswhereDSNgenerationissupposed > tolive. > > Amiltercannotdoit I think:oncewe'veanswered250thesessionisgoneand > there isnomilterintheasyncbouncepath.AndtheMTA'sownbouncegenerator > knowsnothingaboutDKIM2—itwon'tundorecipechangesorsigntheDSNasa > freshmessagewithmf=<>. > > It wassuggested earlier on this ML (Bron?) thatyoucandothisonPostfix > todaywithoutcorechanges,presumablyapipe/transportthatshellsouttoa > DKIM2libraryandre-injects. This seems to be what the reference > implementation on github is doing? > > That would work,butistheexpectation indeedthateveryoperatorwirestheir > ownpipe,perMTA?Thatfeelsfragileand inefficient, if everyone is supposed > to go that way with DKIM2.Istheintentthatthiseventuallylandsin > theMTAs(Postfix/Exim/Sendmail),withthepipejustastopgap? > > Thank you for your time, sharing of knowledge, and energy! > > Kind regards, > > Edmund Lodewijks > > > -- > Edmund Lodewijks <[email protected]> > TZ: UTC+2 / GMT+2 > > _______________________________________________ > Ietf-dkim mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- Bron Gondwana, CEO, Fastmail Pty Ltd / Fastmail US LLC [email protected]
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