Matus UHLAR - fantomas skrev den 2013-02-03 20:41:
only whitelist dynamic ips if there is port 25 open on it,
so any open relay and SMTP redirect gets whitelisted?
nope, if port 25 is open, its another problem, in the way that is could
be static ip, with a dynamic hostname / reverse dns, but it depends on
what mail this dynmic ip want to accept
complicated yes, seem from my own logs is that some domains just setup
mx records, to have abality to send email, but when trying send to this
mx postmaster or abuse does not exists or mx host does not accept
recipient domain, seen here relay denied, and connection refused, fair i
just tempfail that sender so with old postfix reject_unverified_sender,
its less work to whitelist sender domains if sender is known to not want
mail back
