Re: blowback, was A new SMTP "3821" [Re: FTC stuff...........]

On Wed, 2004-12-08 at 18:47 +0000, John Levine wrote:
> I do agree that bounces vs. rejects are an increasing problem, and
> I'm having trouble figuring out if there's any way I can do bounces
> reasonably for the fraction of the mail here for which I can't tell
> if it's deliverable at SMTP time.

The only real answer I've found is to make sure that during _normal_
operation, there isn't actually any mail in that category ("can't tell
if it's deliverable at SMTP time"). 

I do recipient verification callouts (with caching, of course) for the
domains for which I am MX backup (and in some cases, also for mail I'm
forwarding). Obviously it's pointless being an MX backup unless you
actually accept the mail while the primary is down; but that's not
normal operation.

-- 
dwmw2