On Fri, 17 May 2002, David Woodhouse wrote:
> {For how long,} does Exim cache the result of such a callback?
Only for the one incoming process.
> If I do this on a box from which 3 people are subscribed to a list like the
> linux-kernel mailing list, how many connections per day will it be making
> to verify owner-linux-kernel@...?
Far too many. Callback was implemented as an experiment. It now seems to
growing in popularity. The Exim 4 wish list contains this item:
(2) 01-Jan-02 S Cache callout information
This could result in very large databases, because the cache would have to be
keyed on IP address plus sender (or recipient) address.
Unfortunately, I won't be doing much Exim development for the next few
months, until I have completed work on the next edition of the book.
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
