Disabling client IP reverse DNS?

Ken Murchison murch at andrew.cmu.edu
Tue Nov 22 10:33:31 EST 2005

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.

Kenneth Murchison
Systems Programmer
Carnegie Mellon University

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