Re: Working Group Last Call for draft-ietf-sieve-refuse-reject-00.txt
2005-08-19 14:18:17
On 8/19/05 11:13 AM, Mark E. Mallett sent forth electrons to convey:
I snipped a bunch, hope that's OK, because I only wanted to remark on
the "over the open internet" part.
Me too. :)
See txt pic below (view in a fixed-width font)
Example: If the destination AU (using
http://www.ietf.org/internet-drafts/draft-crocker-email-arch-04.txt
terminology; AU=Administrative Unit)
is bigcompany.dom, and Relay2 is some MTA that just relays mail, and is
under the control of the destination AU, then if a Sieve script running
on Dest encounters a 'refuse', and sends a 550 to Relay 2, if Relay 2
then generates a bounce, instead of sending a 550 to MSA, then Dest
MUST NOT be considered compliant with 'refuse'.
+------------+ +-----------+
| Originator | | Recipient |
+-----+------+ +-----------+
| ^
| Internet |
| ___^___ |
V / \ |
+---------+ +--------+ +---------+ +----+----+
| | | | | | | |
| Source +--->| MSA +------>| Relay2 +----> | Dest |
| | | | | | | |
+----+----+ +--------+ +---------+ +---------+
\_________Destination_AU__________/
Further example: If Dest was once reachable directly from the
Internet and supported 'refuse', and was then protected by Relay2 then
(depending on Relay2's abilities) Dest might no longer support
'refuse', through no fault of the coder of the software on Dest. It
would be the AU administrator's responsibility to support 'refuse', or
stop claiming to support it.
BTW, fastmail handles *outgoing* mail like this - synchronously: If
I try to send to foo(_at_)nonexistent(_dot_)dom, I an error message pops up in my
mail client (Thunderbird). (I've attached a .png screen shot, which may
well not make it through to your screen.) (This is far superior to
getting a message in my inbox from the postmaster/mailer-daemon.)
![error msg](xpngzznudqlhSa.png.pagespeed.ic.qed2qgRSEA.png)
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