On Sep 17, 2007, at 4:05 PM, Chris Maness wrote:
Looks to me like a failed sender verification callout-- these are
generally construed to be abusive. I can't easily tell from your
munging whether it's your server or Adelphia that's doing it, though.
This is the only e-mail address that I am having this problem with,
and it has been going on for a year or so now. What other info
would you guys need to tell what it is. I guess I don't understand
the whole "sender verification callout" I'll have to do a little
google to find out.
The idea is pretty simple: when someone sends you an email, you delay
accepting it until you can confirm that you can send a reply back to
the sending address, or more precisely, check whether you can do a
MAIL FROM: your domain and RCPT TO: the sender, and have it return
OK, without actually going into the DATA phase and delivering a test
message.
This idea works fine for normal email addresses, but fails miserably
with certain types of automated email which is not intended for
people to reply to, and it also tends to lose out with TDMA (http://
tmda.net/). More importantly, it also fails to work with itself--
other people using "sender verification callouts" cause a loop of
failed deliveries, as neither side trusts the other.
--
-Chuck
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