If you work with a lot of different mailings, it might be a good idea to categorize them. Then you can simplify the overview of all mailings in your overview, and choose to display mailings for only a specific category. For example Training fees, FFO, Football schools - or if a club does several sports, then you can categorize into Football, Handball, Basketball, Skiing, etc. This is not a mandatory field, and can be ignored if you are a smaller club.

You set up the categories under "Settings" and "Manage categories".