On Tue, Oct 28, 2003 at 04:31:23PM +0000, B. Johannessen wrote:
Bounce messages are sent with null reverse-path, precisely not to
create mail loops. This is the behaviour suggested by RFC 2821,
section 3.7, second last paragraph.
Most MTAs have triple bounce detection (and loop prevention otherwise). I'm
sure there are ways to break it, but RFCs generally don't endlessly deal
with "what if"s caused by not following the RFC.
SMTP+SPF will change bounce or 550 conditions, but the actual format of
those falls outside the scope of SPF. Likewise, I'd probably look for a
smtpd (patch) which doesn't implement the description because I don't need
third-party definitions of error messages in my servers. I'd prefer it if
the recommended use of that field would be to add a Received-SPF-Info
header.
Rob
--
Rob Kaper | "In the name of sheer pity, won't someone operate on
cap(_at_)capsi(_dot_)com | Chairman Arafat and put that poor cancer into a
cleaner
www.capsi.com | environment? -- Rick Brookhiser
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