A static address solves part of the problem, you will no longer need a send service.
But you still need to address security and encryption.
To access your system you will need to open a port on the router. This is not a very good idea.
I may have asked his before, can your modem/ router be put in pass through mode, so it no longer acts as a router, it uonly acts as a modem. You will need to ask your internet provider, or people that use your internet provider.
How much is your provider charging for the static IP.