Wietse Venema wrote:
Mark Goodge:
The cache has two main functions:
1. To reduce traffic between the gateway and destination server, and
reduce load on both.
2. To allow the gateway server to correctly handle mail
acceptance/rejection when the destination server is unreachable.
If the cache is good enough for 2) then it makes no sense to
skip the cache for 1).
It would if even the short lag for cached failures (or, for that matter,
cached successes) to expire is unacceptable. A typical example might be
a webmail system which allows users to change or create addresses
whenever they want to, and have those changes instantly reflected in
what mail is accepted and rejected.
Mark
