On Fri, Jun 29, 2007 at 01:25:15PM -0700, John W. Baxter wrote:
I wasn't referring to sender verification callbacks (which we do not use). I was referring to recipient verification callforwards, where the edge MTA doesn't know valid recipients but some internal (or even customer) MTA does. Exim can configure these easily (but that doesn't help because Mailman doesn't act like an MTA). I don't know about any other MTAs in this regard.
Ah, understood. *Those* I highly approve of, since they at least help mitigate accept-then-bounce issues due to non-existent recipient addresses at the final/internal/destination MTA. Whether it's done by callforwards, or LDAP lookups, or script-generated virtual user tables, or aliases, or whatever, I'm all for it.
---Rsk