add capability getter for CHATMAIL_DOMAIN

scripts/get_capability.py

@@ -0,0 +1,11 @@
+import os
+import time
+import imaplib
+
+domain = os.environ.get("CHATMAIL_DOMAIN", "c3.testrun.org")
+
+print("connecting")
+conn = imaplib.IMAP4_SSL(domain)
+print("logging in")
+conn.login(f"measure{time.time()}", "pass")
+print(conn.capability())