diff --git a/worker.py b/worker.py
index 2911cc2..f8fd2d8 100644
--- a/worker.py
+++ b/worker.py
@@ -22,6 +22,7 @@ messages = []
 for f in tempdir.glob("*.mmm"):
     mission = Mission.fromFile(f)
     messages.append(mission.to_message())
+    f.unlink()
 
 smtp = SMTP.fromConfig(config)