On 8/5/2010 7:05 AM, Wolfgang Zeikat wrote:
Various sender domains use MX records like mail.spam.domain
that point to an IP that has a DSL PTR record, like
123-345-78-9.dsl.some.provid.er
Can I catch those using a table entry like
/\.dsl\.some\.provid\.er$/ result
?
Or would I have to use their IP or their A record, e.g.
mail.spam.domain?
Regards,
wolfgang
check_sender_mx_access can match the MX records, which should
be a name, and the IP(s) that name resolves to; multiple
results are processed in pseudo-random order. Postfix does
not attempt to reverse-resolve the IP to a hostname.
So, if the spammer lists 2-2-3-1.dsl.some.provid.er as an MX
record, postfix can match it. If the spammer lists
mail.spammer.com as the MX, and that IP belongs to a dsl,
postfix can only match that by IP, not the name.
-- Noel Jones
