Thank you for your answer, Russell!

>  > Am I right that qmail-pop3d gets the hostnames of the clients 
>  > (which do not have any)? And that because of this, the line goes 
>  > up? (Can't get the host that actually causes the dialup (via 
>  > tcpdump), because the clients are masqueraded behind the server)
> Whenever you access a server hosted by tcpserver, tcpserver attempts
> to set several environment variables.  Two of these, TCPREMOTEHOST and
> TCPLOCALHOST, are set to the reverse DNS entry for the remote and
> local IP address.

hmm. Unfortunately I'm using inetd (now). Are there any 
experiences? Would entries in /etc/hosts for the local machines be 
ok for inetd?
(I will switch to tcpserver when installing new systems but I
would like to stay with inetd on this system)
 
> The other place where qmail accesses the DNS is in qmail-remote.

According to the Qmail-"Big Picture" qmail-remote is only used 
when sending mail. Am I Right? DNS lookups are ok when sending 
mails.


Mike.

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