nanog mailing list archives
Re: incorrect spam setups cause spool messes on forwarders
From: Jared Mauch <jared () puck nether net>
Date: Mon, 1 Dec 2003 14:03:33 -0500
On Mon, Dec 01, 2003 at 10:50:51AM -0800, Randy Bush wrote:
is the following a general problem, or just one i am seeing?Verizon does SMTP callbacks, connecting back to the MX of the envelope sender and trying to verify that the user exists2003-12-01 10:09:05 1APbBa-000Ork-DY == foo.user () verizon net <foo () psg com> R=lookuphost T=remote_smtp defer (0): SMTP error from remote mailer after MAIL FROM:<nikkiadamczyk () gerbangmail com> SIZE=5365: host relay.verizon.net [206.46.170.12]: 450 Requested mail action not taken-Try later:sc004pub.verizon.netSo this would connect to the MX of gerbangmail.com and try to verify that whatever () gerbangmail com exists. gerbangmail.com. 5h55m6s IN MX 0 sitemail.everyone.net. If the MX (sitemail.everyone.net) doesn't respond fast enough for verizon, their tester times out, and the message gets 4xx'd.interesting but utterly irrelevant. the question was not how verison decided it was spam. the point was that their server returned a 450 as opposed to a 5xx (550 looks good), and this causes net damage.
I think he's saying that they were unable to perform the validation hence the 450. If the validation was successful, they'd return a 200 series code, if it was unsuccessful, they would return a 500 series code. - jared -- Jared Mauch | pgp key available via finger from jared () puck nether net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
Current thread:
- incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Suresh Ramasubramanian (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Neezam Haniff (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Suresh Ramasubramanian (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Michael Loftis (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Steven M. Bellovin (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Charles Sprickman (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Neezam Haniff (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Suresh Ramasubramanian (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Suresh Ramasubramanian (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Jared Mauch (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Jared Mauch (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Joe Abley (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Valdis . Kletnieks (Dec 01)
- Re: incorrect spam setups cause spool messes on forwarders Randy Bush (Dec 01)