-$Cambridge: exim/doc/doc-txt/NewStuff,v 1.20 2004/12/17 14:52:44 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/NewStuff,v 1.22 2004/12/21 12:21:46 ph10 Exp $
New Features in Exim
--------------------
single item are handled.
The dnsdb lookup fails only if all the DNS lookups fail. If there is a
- temporary DNS error for any of them, the remaining lookups are still done,
- and only if none of them succeed does the dnsdb lookup defer. As long as at
- least one of the DNS lookups yields some data, the dnsdb lookup succeeds.
+ temporary DNS error for any of them, the behaviour is controlled by
+ an optional keyword followed by a comma that may appear before the record
+ type. The possible keywords are "defer_strict", "defer_never", and
+ "defer_lax". With "strict" behaviour, any temporary DNS error causes the
+ whole lookup to defer. With "never" behaviour, a temporary DNS error is
+ ignored, and the behaviour is as if the DNS lookup failed to find anything.
+ With "lax" behaviour, all the queries are attempted, but a temporary DNS
+ error causes the whole lookup to defer only if none of the other lookups
+ succeed. The default is "lax", so the following lookups are equivalent:
+
+ ${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}}
+ ${lookup dnsdb{a=one.host.com:two.host.com}}
+
+ Thus, in the default case, as long as at least one of the DNS lookups
+ yields some data, the dnsdb lookup succeeds.
15. It is now possible to specify the character to be used as a separator when
a dnsdb lookup returns data from more than one DNS record. The default is a
19. The Exiscan patch is now merged into the main source. See src/EDITME for
parameters for the build.
+20. If the key for a dnsdb lookup is not an IP address, it is used verbatim,
+ without component reversal and without the addition of in-addr.arpa or
+ ip6.arpa.
+
Version 4.43
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