Hi,
Most of our group mailing lists (which are defined via an LDAP entry
directly accessed by Postfix) are restricted so that you must have or be
spoofing a local email address -- checked via check_sender_access and
rejecting anything not from our own domain. Each list entry in LDAP for
which this restriction applies contains an attribute that defines the
restriction class which contains a check_sender_access parameter that
points to a hash that has just one item, our domain name. And it works
well and cuts down on SPAM and UCE, rejecting the email before it ever
hits the content filter.
Now we are having a problem with SPAM being sent to the lists and
claiming it comes from the list (the From address is the list address).
People get offended and they get angry and they reply to the email which
means it goes to the list and you can see what the intention is. I
would like to be able to use the same mechanism of an attribute in the
LDAP entry for each group email list that we want to restrict from
mailing to itself. Basically, I want to create a restriction class that
only rejects the email when to "to" and "from" addresses are the same.
I've gotten nowhere so far. Can anyone offer me a few pointers.
Thanks,
Rob Tanner
Linfield College
