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.
I agree. That's the best option and it's a good solution in technical
and commercial terms.
--
I must not fear. Fear is the mind-killer. Fear is the little-death that
brings total obliteration. I will face my fear. I will permit it to pass
over me and through me. And when it has gone past I will turn the inner
eye to see its path. Where the fear has gone there will be nothing. Only
I will remain.
Bene Gesserit Litany Against Fear.
