Can not get email to relay Port 25 not open?

[dataforcecrm]

Hi, I have a crm app on a remote server 203.132.83.xx and I can not get it to relay emails from my zimbra server. This server is in India and I do have the MTA set like this:
203.132.83.0/27

this is a sales software tool that sends data from the application. the remote server can not access port 25 on my zimbra server. Please advise.

Thank you very much.

[uxbod]

When you say it cannot access port 25 what do you mean ? Do you not even get the SMTP banner message ? If so I would check any firewalls that may be in the way.