Keep ties and relationships after a departure with this goodbye letter that includes contact information.
Dear {Recipient},
It's absolutely killing me to be leaving, but I'm afraid there's nothing to be done about it. As you know, I've got to go because {reason for leaving}, but I'm really going to miss our {activity done together}.
I know people say they'll stay in touch and never do, but I'd really like to stay in contact with you. I'm hoping we'll have the chance to get together again someday. I'm going to miss {the company, neighborhood, apartment building, etc.} quite a bit.
Anyway, you can write me any time at {address} or even give me a ring at {phone number}.
Best wishes,
{Sender}
