nanog mailing list archives
Re: unwise filtering policy from cox.net
From: Eliot Lear <lear () cisco com>
Date: Wed, 21 Nov 2007 13:16:02 +0100
Hey Paul,
-- Sean Donelan <sean () donelan com> wrote:On Tue, 20 Nov 2007, goemon () anime net wrote:<abuse () cox net> (reason: 552 5.2.0 F77u1Y00B2ccxfT0000000 Message Refused. AURL inthe content of your message was found on...uribl.com. Forresolution donot contact Cox Communications, contact the block listadministrators.)An unfortunate limitation of the SMTP protocol is it initially only looks at the right-hand side of an address when connecting to a server to send e-mail, and not the left-hand side. [...]Sure, it's an "unfortunate limitation", but I hardly think it's an issue to hand-wave about and say "oh, well". Suggestions?
Given what Sean wrote goes to the core of how mail is routed, you'd pretty much need to overhaul how MX records work to get around this one, or perhaps go back to try to resurrect something like a DNS MB record, but that presumes that the problem can't easily be solved in other ways. Sean demonstrated one such way (move the high volume stuff to its own domain). Eliot
Current thread:
- Re: unwise filtering policy from cox.net, (continued)
- Re: unwise filtering policy from cox.net Chris Edwards (Nov 21)
- Re: unwise filtering policy from cox.net Robert E. Seastrom (Nov 21)
- Re: unwise filtering policy from cox.net Leigh Porter (Nov 21)
- Re: unwise filtering policy from cox.net Suresh Ramasubramanian (Nov 22)
- Re: unwise filtering policy from cox.net Adrian Chadd (Nov 22)
- Re: unwise filtering policy from cox.net Suresh Ramasubramanian (Nov 22)
- Re: unwise filtering policy from cox.net Joel Jaeggli (Nov 26)
- RE: unwise filtering policy from cox.net Jamie Bowden (Nov 26)
- Re: unwise filtering policy from cox.net Paul Jakma (Nov 22)
- Re: unwise filtering policy from cox.net Eliot Lear (Nov 21)
- Re: unwise filtering policy from cox.net Suresh Ramasubramanian (Nov 21)
- Re: unwise filtering policy from cox.net Eliot Lear (Nov 21)
- Re: unwise filtering policy from cox.net Suresh Ramasubramanian (Nov 21)