Updated FAQ

FAQ.md

@@ -1943,6 +1943,11 @@ This will be more reliable than forwarding as well because forwarded messages mi
 Since message headers are not downloaded and stored by default to save on battery and data usage and to save storage space
 it is not possible to preview which messages would match a header rule condition.
 
+Some common header conditions (regex):
+
+* *.*Auto-Submitted:.** [RFC3834](https://tools.ietf.org/html/rfc3834)
+* *.*Content-Type: multipart/report.** [RFC3462](https://tools.ietf.org/html/rfc3462)
+
 In the three-dots *more* message menu there is an item to create a rule for a received message with the most common conditions filled in.
 
 The POP3 protocol does not support setting keywords and moving or copying messages.