Often, the LAN uses separate frequencies from inter-city packet links. Please bring any notable exceptions to my attention. Although there are no specific rules that apply to amateur packet radio, the general amateur radio rules force some restrictions on packet usage. This cannot be done without special restrictions. Amateur radio rules prohibit any business.
Profanity can also be a complication.
Since you have no control over the language used in E-mail, proper filtering is required. Since no filter scheme can catch every offense, it is best to say every message must be hand filtered. I would like to set up a packet radio gateway between a land line computer network and the packet network. Yes, and there are several such gateways in use, but they must be managed with caution. Electronic mail may be pass FROM the packet network INTO the land line network without intervention.