Hi all,
SpamCop[1] now officially recommends[2] the use of SPF and/or DomainKeys
for combating the misdirected auto-responders/bounces problem.
There are a few details that are especially notable:
| If the SPF record is too broad, use only the explicitly listed IP ranges
| or mx fields.
I am currently working on a proposal for how the broadness of SPF records
can be measured and used as a confidence criterion. I am going to
introduce it here within the next two weeks.
| SPF is much more widely used, but Domain Keys is more reliable and
| error-proof. Most senders who use Domain Keys also use SPF (there is no
| disadvantage to using both). In short, implementing SPF checking will
| give you the most benefit with the least effort.
We need to work on the public perception of SPF being unreliable or
error-prone.
References:
1. http://www.spamcop.net
2. http://www.spamcop.net/fom-serve/cache/329.html#spf