using exchange mail server

hi ,

i have imported mail server in thingworx and i am able to communicate with gmail accounts, but when i am trying to send emails from my corporate account, i am getting error that not able to connect with port number 25.

i have disable firewall and written inbound and outbound rules for different port as well, but still same error

Note: i am using private corporate network (but still able to connect with gmail but not with microsoft excgange server i;e my office mail id)