On Thu, 21 Dec 2000 jasonr@??? wrote:
> Is it at all possible to disable *all* rdns lookups for smtp sending?
Do you really mean sending? I don't think Exim ever does reverse lookups
while sending.
Or perhaps you mean when something else is sending TO Exim?
Exim only looks up a host name if
(a) You tell it to, by setting host_lookup.
(b) It needs the name because you have specified some checking by name,
e.g. something like
host_accept_relay = *.some.domain
(c) The client host is broken, and sends a HELO command like
HELO the.server.domain.name
What it is supposed to send is
HELO the.client.domain.name
In this case Exim does a lookup to get a client name. Otherwise the
entries in the log get very confusing.
You can test why Exim is doing a lookup by running a simulated SMTP
session using the -bh option, e.g. exim -bh 1.2.3.4 This should
enable you to find out why it is doing lookups.
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
