nanog mailing list archives
Re: incorrect spam setups cause spool messes on forwarders
From: Suresh Ramasubramanian <suresh () outblaze com>
Date: Mon, 01 Dec 2003 13:30:57 -0500
Randy Bush writes on 12/1/2003 1:10 PM:
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 exists
2003-12-01 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.net
So 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.
srs -- srs (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9 manager, outblaze.com security and antispam operations
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)