On Fri, 4 Oct 2002, I wrote:
> Yes - the resolver's natural timeout. This results in a "defer" result
> which should give a temporary rejection.
No, it doesn't. I lied. The manual tells you all about it:
If a DNS lookup times out or otherwise fails to give a decisive answer,
Exim behaves as if the host is not on the relevant list. This is usually |
the required action when "dnslists" is used with "deny" (which is the most |
common usage), because it prevents a DNS failure from blocking mail. |
However, you can change this behaviour by putting one of the following |
special items in the list: |
|
+include_unknown behave as if the item is on the list |
+exclude_unknown behave as if the item is not on the list (default) |
+defer_unknown give a temporary error |
|
Each of these applies to any subsequent items on the list. For example: |
|
deny dnslists = +defer_unknown : foo.bar.example |
Lucky you brought this to my attention. I had neglected to update the
forthcoming book to include this information. It now has it.
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
