I really don't see a need to charge per character. Just charge per message. The point of charging is to make sure there is not a ton of spam going around. With this idea, most players will only have a few message slots in their mailbox, and most would be quite annoyed if they got cluttered up every hour with spam. So that's the purpose of charging per message. I don't really see this as an effective gold sink. There are much better ideas for that.
Another idea to make sure this is not abused is to limit the amount of outgoing messages anyone can send per day, or even per hour. There are real concerns with a system like this. For example, what if a competitor of STS started sending messages to players advertising a different game. You wouldn't want someone to figure out a way to automate the process and start spamming everyone. So there surely needs to be limits on this.
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