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
--
Viktor.
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