Sheeran, 24, said he was once caught in an embarrassing situation at US customs when a few of the emails contained dodgy videos, reported Ace Showbiz.
"The worst email he ever sent me was, I got to customs in New York once and I had 17 new emails from him and I was like, something must be important," Sheeran said.
"And they were all video attachments, and I downloaded the first one, and yeah - it was good. And I was at customs and it's pretty hard to get in to America anyway without those sort of videos. It happens quite a lot," he added.