It appears that Viktor Dukhovni via mailop <mailop@mailop.org> said: >On Wed, Dec 04, 2024 at 07:23:07PM -0700, Andrew Barker via mailop wrote: > >> RFC 5321, indicates the correct code for too many recipients is code >> 452. It also notes that some old servers might also return 552 due to >> an error in an older RFC. Both codes should be treated as a temporary >> error indicating that the number of recipients has exceeded the limit >> for the server. > >The text that indicated that 552 is a temporary error was a mistake, or >perhaps, more charitably, quickly ceased to be relevant. No mainstream >MTA supports this. The mistake is slated to be corrected: > > > https://datatracker.ietf.org/doc/html/draft-ietf-emailcore-rfc5321bis-36#section-4.5.3.1.10
That text is verbatim from 2821 so it may well have been relevant 25 years ago when 2821 was written. We agree it's not relevant now. R's, John _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
