Unable to send mail using mailx/mail from a host

Question

On other hosts when I run something like:

echo 'foo' | mail -s 'bar' user

it sends the mail instantly and if i type mailq i am told it is empty. On this one host the mail command above runs but the mail is never received and if i type mailq i see stuff like:

5B9B340884     4140 Sat Sep  1 04:33:02  root@timber.com
(connect to mailrelay.timber.com[10.33.16.200]:25: Connection timed out)

What does that mean? I don't know what is failing and what would be needed to address this..

Answer 1

It means that host you're sending it from can not connect to the mail relay, in your case mailrelay.timber.com, and is most likely either a firewall or some other networking issue.