[CentOS] Not receiving mail

[m.roth at 5-cent.us]

Dotan Cohen wrote:
> On Mon, Oct 18, 2010 at 22:34, Steve Clark <sclark at netwolves.com> wrote:
>> Hmm... I am not having any problem connecting from the U.S.
<snip>>
>> telnet 178.63.65.136 25
>> Trying 178.63.65.136...
>> Connected to 178.63.65.136.
>> Escape character is '^]'.
>> ^]
>> telnet> close
>> Connection closed.
>
> Exactly the problem! It pings fine (so I know that connections can be
> established over the physical wires) and on the IP address telnet
> answers. However, telnet to port 25 (smtp) with the domain name fails.
> Why could that be?

Bingo! DNS.

       mark