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.
Andrew Barker
On Dec 4, 2024 7:12 PM, Grant Taylor via mailop <mailop@mailop.org> wrote:
On 12/4/24 09:45, Viktor Dukhovni via mailop wrote:
> No, not a "421", since that would normally also be a connection abort,
> and none of the recipients would get the mail.
What do you think about a 450 4.2.1?
> Rather, the correct handling is to softfail the excess recipients
> and accept the initial batch that came in under the count.
Please clarify what you mean by "softfail" in this context. I've seen
different things and would hate to assume incorrectly.
--
Grant. . . .
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