iPhone users have been freaking out over emails they appear to have received from the past.
When we say past, we mean the 1970s - before email was invented.
According to recipients, who tweeted about the strange occurrence, the emails were "all greyed out" and when clicked on, "it disappeared."
The message pops up when users are checking their email in different timezones.
Computers use UNIX time to make sense of times and dates and in this system January 1, 1970 represents 0, the Telegraph reports.
Despite this, iPhone users were still perturbed by the unusual date stamp in their inbox.