Re: [Exim] Thoughts on sender/host verification.

Scott Call <scall@???> writes:

> I've been reading all the discussions of SPF and Yahoo's scheme, and I
> had a thought.
>
> Like most thoughts I'm sure somebody else has had it, and probably
> dismissed it, but I wanted to share it. Feel free to heckle or pick it
> apart.
>
> Both SPF and Yahoo's domainkeys limit the sender to a particular server
> or set of servers. Since that lock-in is sure to rankle some, I think I
> may have a better way.
>
> Basically it would be a dynamic DNS (or LDAP but since DNS is the
> current distributed database protocol of choice in the Internet mail
> I'll stick with that for my example) lookup to determine if a sender is
> allowed to send from an IP/Email Address pair.

I do not see a benefit compared to SPF, and i do not want to have the
job to keep DNS-TXT-entries and valid email-Addresses in sync. Think of
large sites...

christoph