Hidden feature: group email in iOS 6

I found a hidden feature in iOS allowing you to send email messages to a group of people without having to type each person individually on each message.

To do it, create a new contact name for the group and enter all of its email addresses together as one long email address with each person separated by a semicolon.

For some reason, semicolons are not allowed there, so you need to type all this stuff somewhere else and just copy and paste the whole thing into the new contact's email address.