Disabling client IP reverse DNS?
murch at andrew.cmu.edu
Wed Nov 23 07:53:40 EST 2005
Scott Balmos wrote:
> Ken Murchison wrote:
>> Scott Balmos wrote:
>>> Hi all,
>>> I know in a virtual domain setup, if a user connects with an
>>> unqualified username, the server does a reverse DNS lookup on the
>>> *server's* incoming connection IP, to determine a default virtual
>>> domain name.
>>> But how do I disable Cyrus from doing a reverse DNS on the *client's*
>>> IP that they're connecting from? Connections to my mail server from
>>> home are taking very long because of a reverse DNS lookup being done
>>> on my home IP. This fails because my stupid cable Net ISP doesn't
>>> know how to run DNS properly. :)
>> Set the 'virtdomains' option to 'userid' instead of 1/yes/on.
> This does not solve the situation. I am not in a virtual domain setup.
> But even with the noted change, the system continues to attempt a
> reverse DNS on the *client* IP.
Sorry, I didn't read closely enough. I don't believe there is a way to
disable this without making changes to the source. Some SASL mechs
require the IPs, so we do the lookup before authentication.
Carnegie Mellon University
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