When you say send mail on port 587, are you referring to sending mail from the LAN to the WAN on port 587? Or a port forward translation from 25 on the WAN to 587 on the LAN?
On the RVS4000, you can perform port translation by going to the Firewall Page, then Single Port Forwarding. Create an application name (text based, will not affect config) and then you can choose an external port to internal port. Lastly point to the internal IP address of the mail server.
If you are referring to sending mail on port 587, the router is by default going to allow all outbound traffic out and will not block or filter ports.
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