From: itojun_at_no.spam
Date: Sun Nov 04 2001 - 22:31:20 PST
>>I think we're talking past each other. Let me try again, with a clearer,
>>better question:
>>
>>RFC1893 lists a number of status codes to be used when a message cannot be
>>delivered. If the target domain exists, but mail cannot be sent there due
>>to protocol mismatch, which RFC1893 code should the SMTP sender use? Or
>>should an additional status code be defined?
> hmm now I see what you are talking about. my guess is 444
> (persistent transient/unable to route), but i'm not 100% sure.
thought about this again, and found that the following two cases
should raise the same error code. what is the commonly-practiced
error code for the former case? then, we know the error code for the
latter case.
(let us assume that the sender is an IPv4-only MTA)
example.com. IN MX 1 mx1.example.org.
; no A for mx1.example.org
example.com. IN MX 1 mx1.example.org.
mx1.example.org. IN AAAA 3ffe:501:ffff::1
itojun
This archive was generated by hypermail 2.1.7 : Fri Oct 06 2006 - 00:00:25 PDT