I also tried putting in the IP address field with port# (192.168.0.1:587) but it will not accept that.
Hello, currently there is no way to do this for Intel Active System Console.
If there is no port configuration field, try iptables to workaround this,
iptables -t nat -A OUTPUT -p tcp -d <ip_address_of_SMTP> --dport 25 -j REDIRECT --to-ports 587
Hope this helps.