[65529] in North American Network Operators' Group
Re: incorrect spam setups cause spool messes on forwarders
daemon@ATHENA.MIT.EDU (Steven M. Bellovin)
Mon Dec 1 14:43:28 2003
From: "Steven M. Bellovin" <smb@research.att.com>
To: Michael Loftis <mloftis@wgops.com>
Cc: nanog@nanog.org
In-Reply-To: Your message of "Mon, 01 Dec 2003 12:23:29 MST."
<10021859.1070281409@d216-220-25-60.dynip.modwest.com>
Date: Mon, 01 Dec 2003 14:42:50 -0500
Errors-To: owner-nanog-outgoing@merit.edu
In message <10021859.1070281409@d216-220-25-60.dynip.modwest.com>, Michael Loft
is writes:
>
>I personally haven't seen ANY validation, just an arbitrary block that's
>been in place for over a month without cause, reason, or even any ability
>to contact them.
Right. Assuming that the described validation scheme is, in fact,
what's being used, you'd expect Verizon's mailer to retain and cache
the validation. That way, a single 450 can be turned into a 200 series
or a 550.
As Randy said, 450 means "there's a problem here that should be fixed
soon; come back later". If it doesn't change, it's not a 450.
--Steve Bellovin, http://www.research.att.com/~smb
