Sony Xperia Z3 User Manual page 89

Muting Threads
If registered on a mailing list, there will be threads with
always-continuing conversations. For long threads that are
not important, mute the threads and they will no longer
appear in Inbox. When mail arrives that includes user's address
as a recipient or in Cc, mail will again appear in Inbox.
In Home Screen, (Google)
Inbox opens.
Touch & Hold target thread
・Several threads are also selectable.
Mute
Thread is hidden.
・ Tap
UNDO to undo mute.
(Gmail)
Deleting Threads
In Home Screen, (Google)
Inbox opens.
Touch & Hold target thread
Thread is deleted.
・Several threads are also selectable.
・ Tap
UNDO to undo deletion.
87
(Gmail)