[EMAIL PROTECTED] wrote:
> Hello!
> I can't receive any mails. After tracking this problem
> for a whlie I tried to telnet to the server on the smtp port.
> I got as far as entering the "MAIL FROM" line, then I had to wait fo 15
> about minutes, and then got "417 DNS lookup failure: mail.com. Try
> again later.". Now, my server is behind a NAT router, so I suspect the
> problem is there... So is it possible to disable this DNS check or make
> some other configuration adjustments? I already have
> TCPDOPTS="-stderrlogger=/usr/courier/sbin/logger -nodnslookup
> -noidentlookup"
> in my esmtpd...
Could you do some tests ?
What is happening when you issue nslookup www.linux.org ?
If you have problems with DNS resolution due to restrictive
configuration of your NAT/firewall machine, you can install
BIND.
Then, in the /etc/named.conf put:
query-source address * port 53;
This should help if firewall is set up to accept UDP
connections only between ports 53 (most stupid one I have seen).
You can also try an option like:
forwarders { 1.2.3.4; 2.3.4.5; };
This should help if your firewall limits DNS servers to which
your computers can connect.
Of course to all this work you should also put only one definition
of the nameserver into /etc/resolv.conf "nameserver 127.0.0.1".
(I have seen similar DNS problems in the network managed by someone
and "secured" using tiny CISCO 17xx router as a "firewall")
Regards,
Blizbor
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