The rule is quite simple. And I expect EVERYONE to follow it. Consequences for not following it is a huge penalty on your nation, or a ban.
PM's are not to be swapped between players. If you want to talk to a player about something, or plot or whatever.
Send me the PM, the name of the player you're sending it to, and the message. Then the other player does the same with me, and I pass it back. This rule has been put in place to make spies a good tactic and useful for finding out who your enemies are. Of course, people could just lie about information, or attempt to use their own spy to find out if they're being spied on and so forth.
PM's are not to be swapped between players. If you want to talk to a player about something, or plot or whatever.
Send me the PM, the name of the player you're sending it to, and the message. Then the other player does the same with me, and I pass it back. This rule has been put in place to make spies a good tactic and useful for finding out who your enemies are. Of course, people could just lie about information, or attempt to use their own spy to find out if they're being spied on and so forth.