Hi:
I've checked your smtp server at imap.ooorah.net, and I could find out it is accepting messages:
pablob@medusa /home/pablob$ telnet imap.ooorah.net 25
Trying 70.88.130.29...
Connected to imap.ooorah.net (70.88.130.29).
Escape character is '^]'.
220 ooorah.net ESMTP Postfix (2.0.11)
HELO mail.wanadoo.es
250 ooorah.net
MAIL FROM:
kk@yahoo.es
250 Ok
RCPT TO:
root@imap.ooorah.net
250 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
Testing your incoming box for linuxquestions.org
.
250 Ok: queued as A157937CAE
QUIT
221 Bye
Connection closed by foreign host.
From the resulting session you can see my message was at least queued. You'll have to find out where it goes. Check within /var/spool/postfix/ , maybe there you can find the sequence number A157937CAE with my message.
As you say you can't also send, you must be receiving an error within any log file; check under /var/log/mail/ .
What about firewalling.
SSH ? As far as I know there's no relation within ssh & postfix. I don't use RHat so I can't help you with what goes on with redhat-switch-mail.