RS> Synchronet and SBBSecho has always treated the to, from, and subject RS> fields in FidoNet "Stored Messages" (*.msg files) and "Packed RS> Messages" (those contained in type 2 packets) as null-terminated RS> strings with a maximum *usable* length of 35 characters for the "to" RS> and "from" and a maximum *usable* length of 71 characters for the RS> "subject".
After discussion in the FTSC echo, it is the FTSC's position that this is the correct interpretation of FTS-0001.016. These fields must be null-terminated, and the length specified includes the required NUL (0x00) byte.