Lost in the mail

Sometimes things just get lost in the mail. It's a sad fact of life. I tried to send something to someone over a month ago, and I got an email from them saying it hadn't arrived. So now what? I'm not sure. There's a particular post office in my area that tends to lose things for me. I don't know why. It's not the first time, nor will it be the last. I guess with so many letters, packages, and other things going in and out of the place, it's logical that some things will get lost. I just wish it hadn't been this particular thing. Because I'm sure the recipient will not believe it was lost in the mail.