Lets you send money through email
So there are many ways to send money in the digital world, such as Google Wallet, Paypal and many more. Now there is one that actually let you send money through email. The thing is all you have to do is CC: the email to firstname.lastname@example.org and put the amount in the subject line. Then Square Cash send you an email confirming your card information and the money arrives between 2-3 days.
This is something I would not do simply because, the amount of emails that gets hacked on a daily basis is ridiculous. I would not put my trust in it until I know how secure it is. If people do it, thats on them but me personally I would not do it. I simply can't do banking on email.