On 2023-02-28 10:46, ml+mailop--- via mailop wrote:
On Tue, Feb 28, 2023, Andrew C Aitchison via mailop wrote:
Is there an SMTP equivalent of the HTTP 30x status codes ?
Maybe this: RFC 5321:
551 User not local; please try <forward-path> (See Section 3.4)
Attractive idea, but impractical in the real world.
Imagine sharing PPI that the sender doesn't have.
Email end users do not always get the full message when sending.
ESP's would probably not be in their right to change the email address
on their lists without permission
5xx will cause them to be taken off mailing lists.
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