Camille Minichino has published 3 mysteries under the pen name of Jean Flowers in her "A Postmistress Mystery" series:
"Death Takes a Priority", 2015
"Cancelled by Murder", 2016
"Addressed to Kill", 2017
The police are aided by the amateur sleuth, a small town Massachusetts postmaster. A fair bit of c2015 era postal stuff is interwoven as patrons often come to the post office. Lite reading. Here are scans of the paperback editions:


