Used stamps exchanges.

How do you remove yourself from the list? I want to leave but don't want to get more than I've sent out.

It wont affect travelling letters. The letters can still be registered.

This function is not yet implemented. It's on the list with thinks to do.
In you case, you have one letter travelling from you, none travelling to you, and only one letter in difference. So when this letter arrives, you will be even.

If you delete your address you automatically suspend yourself both from sending and from receiving stamps.