Several users have reported an issue in the Mail app on iOS devices (iPhone, iPad, iPod touch) displays mysterious messages with no subject and no sender.
These items usually display the following:
- (No Sender)
- (No Subject)
- This message has no content
Disable then re-enable Mail. Go to Settings > Mail, Contacts, Calendars and tap the account in which the phantom messages are appearing. Slide Mail to “Off” then exit Settings and go to Mail; the messages should be gone. Now go back to Settings and turn Mail back on.
Force quit Mail. Go to the home screen, then double-press the Home button to bring up the multitasking pane. Find the Mail app, then hold its icon until it begins to wiggle, then tap the small red circle in the upper-left corner of the icon to quit it. Relaunch Mail, and the messages should be gone.
Turn off threading. Go to Settings > Mail, Contacts, Calendars and turn off ”Organize by Thread.” This may prevent the phantom messages from appearing.