Dear Angela, I hope you and your family are doing fine, and I’m sorry I haven’t been in touch with you recently. I’m writing to let you know that I've resigned from my previous company and took a new job recently.
Dear James, I hope this letter finds you and your family well. I'm sorry that I couldn't write to you for the last couple of months.
Dear Kathy, Hope you are doing well. It's been a long since we have last met.