If you’re the type of person to delete ‘Sent from my iPhone’ on your emails then you might want to rethink doing so next time…

Anyone with an iPhone will know that the pesky little email signature will appear on messages you’ve sent from your cellphone.

It may appear to be some kind of brag that you have an Apple device rather an Android (we’ve all heard of the green bubble message ick), but it turns out that the feature is for a totally different reason and is actually there to do you a favor.

It’s important to know since a lot of us are sending work emails from our phones outside of office hours. A recent survey of 2,000 adults over in the UK found that 30 percent of 18 to 34 year olds check their work emails in bed, while 19 percent go on to reply to them.

And it’s because some workaholics are sending emails on the train or at the dinner table that the ‘Sent from my iPhone’ feature is actually worthwhile.

Explaining the method to the madness and urging people to keep the Apple-focused email signature, Rob Ashton, founder of learning company Emphasis, said: “The short answer to the question of whether you should write ‘Sent from my iPhone’ is: yes, you should. Or, at least, you should indicate that you’re sending the message from some sort of mobile device.”

Rob continued to write: “But the reason why is longer. Not only that, but it’s the key that unlocks a fascinating area of communication science. Knowledge of that science can enable you to improve everything from a response to a customer-support request to a bid for a contract worth many millions.”

One particular study involving 111 participants found that when a message that was riddled with mistakes had ‘Sent from my iPhone’ at the bottom of it, it reduced the ‘damage’ caused by sending an arguably sloppy email as people were more forgiving about the errors — particularly in a workplace capacity.

If you’re still not convinced about having’ Sent from my iPhone’ as your email signature though, there is a way to turn this feature off.

To do so, simply go to the Settings feature on your phone, the Mail, then Signature. It’s here where you delete the default signature from the text box.

You can either leave it blank or add your own sign off. Might I suggest ‘No cheers, only tears’, or maybe ‘Lukewarm regards’ as an alternative?