On 10/18/2010 3:38 PM, Dotan Cohen wrote:
On Mon, Oct 18, 2010 at 22:34, Steve Clarksclark@netwolves.com wrote:
Hmm... I am not having any problem connecting from the U.S.
ping 178.63.65.136 PING 178.63.65.136 (178.63.65.136) 56(84) bytes of data. 64 bytes from 178.63.65.136: icmp_seq=1 ttl=49 time=140 ms 64 bytes from 178.63.65.136: icmp_seq=2 ttl=49 time=142 ms 64 bytes from 178.63.65.136: icmp_seq=3 ttl=49 time=138 ms
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?
No the example above shows a telnet to port 25 connecting - which I can reproduce too - but there is no 220 response as there should be from a mailserver. Either the process is hung or configured to black/graylist unknown connections, or something other than mailserver is listening on port 25.
Telnet is going to go to an A record, so you have to look up the MX record first, then telnet to the target.