incorrect spam setups cause spool messes on forwarders
suresh at outblaze.com
Mon Dec 1 18:30:57 UTC 2003
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 at verizon.net <foo at psg.com> R=lookuphost T=remote_smtp defer (0): SMTP error from remote mailer after MAIL FROM:<nikkiadamczyk at gerbangmail.com> SIZE=5365: host relay.verizon.net [126.96.36.199]: 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 at 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 (postmaster|suresh)@outblaze.com // gpg : EDEDEFB9
manager, outblaze.com security and antispam operations
More information about the NANOG