According to multiple user reports, it seems that there are a fair number of iPhone and iPad users who are reporting that they are receiving ghost emails from the 1st of January, 1970. These emails apparently have no send, subject, and it also seems that they cannot be deleted as you can see in the screenshots above.
The good news is that these weird emails, apart from being a tad creepy, do not seem to do any harm. It also seems that those who are affected by the glitch are those who have changed timezones recently, such as when traveling, so if you haven’t then we reckon you should not be experiencing any of these issues.
If you are experiencing it, there is a fix and that is you need to quit the Mail app, followed by a restart of your phone by pressing and holding down the Home and Power buttons at the same time until the phone turns off and the glowing Apple logo appears. Users who have tried this have reported that the emails are gone after that.