add fqdn as possible myorigin value

tests/test_email.py

@@ -79,7 +79,11 @@ def check_relay(relay_host: str, relay_port: str, domain: str) -> tuple:
             myorigin = out.replace("myorigin", "").strip()
         # possible origin names
         origins = set(
-            (domain or None, u.exec_cmd("hostname", log_output=False)[1] or None)
+            (
+                domain or None,
+                u.exec_cmd("hostname", log_output=False)[1] or None,
+                u.exec_cmd("hostname -f", log_output=False)[1] or None,
+            )
         )
         if myorigin not in origins:
             u.warning('"myorigin" setting does not contain a valid domain')