Postcrossing is pretty good for the quick mail fix, but it seems a little sterile. Yes, you get great postcards from all over the world, but in general it feels very impersonal. Even though there are options to strike up a correspondence with your fellow Postcrossers, it's generally a one-off kind of thing. Getting mail means more when you are receiving letters and postcards from someone to whom you feel like you could talk in person, as well as on paper.
The Month of Letters website has a forum, where members can discuss letter-writing, introduce themselves, and find new penpals to write to. The whole thing is pretty simple, and members can be as active or as "lurky" as they want to be.
I already have some potential penpals I have gotten from this site and from the forums on the Fountain Pen Network, but I could always use more. Do you want to write me? I would welcome any and all letters. I will write back, too!
Here's how you can get in touch with me:
142 Sweet Bay Trail
Petal, MS 39465
Happy letter-writing and mailing!