Reminder Letter

Hello! I just wanted to ask for the option for email reminders, If I opt in to that in my personal tax account, the yearly reminder to file self assessment sent in April, will that just be sent to my email or it will be both a physical letter and email? I opted in when I first signed up for self assessment and I got physical letter that reminder to file

Hi KAg,
If you opt in for paperless online then the notice to file will be sent to you electronically and not by paper in the post. 
Thank you.