Just a question, if you have 2 bad ratings, don't have a chance to send letters to other people, the persons that give bad rates don't want to talk about re-sending or something like this, what happens? It'll banned from the group?
The limitation is not permanent. Only the last 10 ratings are considered. So, if your next 10 exchanges are neutral (3 stars) or positive (4 and 5 stars) the limitation will be removed.
Also the limitation can be removed if you convince your partner to increase your rating. Those ratings can be changed. You can convince your partner that the rating is not fair or maybe you two can agree to replace some of the stamps that maybe were damaged.