"Fan mail" refers to letters or messages sent by fans to show their admiration or support for someone, such as a celebrity, artist, or public figure. Full definition
From the amount of fan mail I receive, I'm sure these women will continue to live on in the hearts of my readers for a long time to come. (bookpage.com)
It does get quite addictive as you complete battle achievements, fulfill the requirements of random missions and getting fan mail for all your accomplishments. (heavy.com)
The occasional fan mail from a reader tells me I'm connecting with at least a few dedicated readers. (killzoneblog.com)