--Brian Candler <B(_dot_)Candler(_at_)pobox(_dot_)com> wrote both of:
The advantage of the callback is that you can say for certain that this
*particular* message must have originated from that ISP, and within a
known timeperiod of a few days. It also guarantees that should the
message fail to be delivered, the bounce would be deliverable.
Plus it's a reasonably useful filtering technique in its own right, which
means there's immediate benefit to you in implementing it even if no-one
else has started using SRS.
Excuse me if this has already been asked, but what is the effect of
SRS-encoding a sender address that is already in SRS format? If you send
everything out with SRS-tags, are you risking them being irretrievably
mangled if some recepient actually uses SRS for forwarding? How many times
can SRS iterate in serial before the original is unrecoverable, or some
other limit is hit?
--
Greg Connor <gconnor(_at_)nekodojo(_dot_)org>