+ 3. A msg:defer event.
+
+ 4. Client-side support in the gsasl authenticator. Tested against the plaintext
+ driver for PLAIN; only against itself for SCRAM-SHA-1 and SCRAM-SHA-1-PLUS
+ methods.
+
+ 5. Variable $local_part_verified, set by the router check_local_part condition
+ with untainted data.
+