Antonio Dragone sent the message below at 14:31 5/22/2006:
Thank you very much to all!
I have solved the problem with your guidance
After reading the last messages from Mark, Peter and Matt, I decided
to dig into the "list address affair (the sender header)" for my
surprise, the email sender was "listname-bounces[at]myhostname"
instead of "listname-bounces[at]myhostname.domain_name", after
changing the option "host_name" in "General Options" to a full
qualified domain name, the problem was solved!

My ISP was discarding the messages because the sender was not
formatted properly... not a "legal" name for their SPAM filters I
---------------- End original message. ---------------------

It probably has nothing to do with spam filters.
If your ISP has their MTA properly configured so
it is not an open relay, it is very likely the
MTA refusing to relay mail from a source it does
not recognize as valid. Without the fully
qualified domain name, the MTA has no idea if
somebody is trying to bounce spam off of it, it
needs it to verify that the mail is from an allowed sender.

This is a good thing.


Venimus, Saltavimus, Bibimus (et naribus canium capti sumus)

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