Paul doesn’t extend any greetings by name. In other letters, we see Paul extend personal greetings, 2 Timothy for instance, “Eubulus greets you.” But in this letter in particular, it is just a greeting from “God’s people.” There is an awareness to the importance of anonymity in this present moment for Paul. He has counted the cost of following Christ as he sits in jail writing this letter, and he takes care to not mention other believers by name.