Jordi Espasa Clofent:
> > That is easy.
> >
> > Have your users connect to the submission port, and let everyone
> > else connnect to the smtp port. Then, specify "=o content_filter=whatever"
> > for the smtp port and not for the submission port.
>
> Yes Wietse, I've considered this simple and clean option, but we're a
> hosting company and the costumers are to lazy to understand and accept
> an approach like this.
You can tell the users that the "submission" port gets a better
level of service than port 25, because they share that port with
spammers.
As you pointed out in your original email, they would be subject
to less filtering, and therefore there would be less delay, less
false positives, and so on.
Wietse
