[exim] retry => reroute?

If a message is deferred because of transport problems, does it get
re-routed when it is retried?

I can't tell from the manual what the behavior is. It refers to a
"delivery attempt"; I can't tell whether that's a complete rerun of
message handling or just of the transport. The manual also says that
transports manage their own retries, which suggests they might just
re-attempt the delivery.

Roger West's example (thanks for the reference) from 2010-03-09 seems to
imply rerouting occurs on retry, though it's not clear exactly how he
forced the mail off the queue.

Searching around, I also found a message that seemed to imply the
routing was permanent--sorry can't find it now.

Ross Boylan