Peter Bowyer wrote:
We're talking about an outbound relay sending to arbitrary
destinations, with verified senders. Callouts are a waste of time,
because it can deliver a bounce to the known sender if it's unable to
deliver a message.
Which known sender would this be?
The one which it authenticated, or which an upstream trusted MTA
authenticated. It's an outbound relay for a known community of users.
Ah, sorry; first time I've seen authentication mentioned.
The original just said "accepting anything from a list of
known IPs".
With auth, yes, accept-then-bounce is permissable (but still
suboptimal, I think. I prefer, as a user, an instant error
to my mistyping a destination address. As a networking engineer
I prefer the fewer number of connections).
- Jeremy
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