We have a server in our DMZ which has access to the kemp on port 25. our firewall is ASA 5525.
From our server in the DMZ is is not possible to send a mail, but from our lan servers is working fine. we can see in the ASA log that a connection on port 25 is open but is simply do not work..
Esmtp is disabled. when trying to send the mail from the DMZ to the Exchange bypassing kemp everything works fine.
From kemp is it possible to ping the DMZ server. all lan servers can send via the kemp.