March 25, 2008
6:35 a.m.
Jo Rhett writes:
On Mar 24, 2008, at 6:45 PM, Mark Sapiro wrote:
I still don't get what you mean by "properly deal with DSNs". Are you saying that an MTA should never return a DSN? It should either reject the mail during the incoming SMTP transaction or forever hold its piece?
Yes. And not just me, but a dozen different blacklists.
Unfortunately this attitude does seem to be catching hold. I was told recently that a secondary MX would have to stop functioning as such because his ISP insists that he have an up to the second list of all valid mailboxes at my site; he's not allowed to relay undeliverable mail to me *ever*.
So much for the whole concept of a store-and-forward mail system. :-(