In message <[EMAIL PROTECTED]>, 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
