Should be include ♥@data.in examples also in this guide.. and also reference to these special UTF8 characters.. which people can use now to create mailbox and use them to communicate. 

♥@data.in is valid mailbox as of now, you can try sending emails to this ID. I am successfully able to send and receive emails to my gmail account.  This way all UTF8 icons ( https://www.utf8icons.com/) will also form a valid email address. 

Looking for views / comments. 

Take care.