Re: [tpop3d-discuss] Re: Long Login delay

[Chris Lightfoot]

On Tue, Jan 20, 2004 at 04:37:28PM +0100, Ian Armstrong  wrote:
> I am having trouble understanding the "listen-address" directive in the
> "tpop3d.conf" file. The man page for tpop3d.conf says:
> 
>               to  accept  incoming  connections  and  associate  them with
> the
>               proper domains.  Note that for this to work, all  interfaces
>  on
>               which  connections  are  to  be  accepted  must have
> functioning
>               inverse name resolution; also, in this case, tpop3d  will 
> do  a
>               name lookup for each incoming connection, which may block in
> the
>               event of a DNS failure. You may wish to create some  other 
> map-
>               ping  --  perhaps  in /etc/hosts -- to ensure that this does
> not
>               occur.
> 
> I think this is what is slowing my connection down. tpop3d is doing a DNS
> lookup for every connection. I only serve email for one domain
> "expressmail.dk" and the pop server runs on localhost.
> 
> My listen address is set to this:
> 
> listen-address: 0.0.0.0(expressmail.dk)
> 
> My network functions normally.

No, that's only in the context of setting a regular
expression for the domain. But tpop3d may also do reverse
DNS queries if you use tcpwrappers.

-- 
``Of course, it doesn't matter much where you live south of the river these
  days. Under the New London Plan, they're going to lump all those areas
  together... and call them Brighton.'' (Flanders and Swann)