Here is food for thought:
I found this interesting documentation note is a "Professional Spammer"
Mass Emailer web site. Name removed to protect the ignorant.
SPAMMERX provides bounce handling capabilities such that after
an e-mail address has bounced a certain number of times,
SPAMMERX will cease sending to that address in future e-mail
campaigns. SPAMMERX does not distinguish between hard and soft
bounces but does categorize between more granular categories
of bouncebacks, including out-of-office autoreplies, mailbox
full, and user-not-found bounces. Only bounceback messages
indicating that the e-mail address is truly invalid are
actually counted as true bounces. Out-of-office autoreplies
and mailbox-full bounces are never counted as true bounces. By
default, your SPAMMERX account is set so that after an e-mail
address has bounced three times, SPAMMERX will stop sending
future e-mail campaigns to it, even if you try to send to it.
Interesting, so this Mass Mailer "Spam" service ignores 4xy/5yx and will
try at least 3 times to the same address before it does something with
the address.
I didn't catch well what it meant by "hard and soft bounces" and
"BounceBack Messages?" Does that main a real accept/bounce transaction
or a 5xy response? or both?
Gees, no wonder these guys get such a bad rap! They can actually harm
their own customers by not RESPECTING rejects!
Anyway, just thought this was interesting.
--
HLS