Google has infuriated millions of Gmail users by apparently making it possible to email anyone on Google+ - even if you don't have their email address.
Under the change you can now email any of your Google+ connections, just by typing their name.
...Even if you haven't given those contacts your email address.
The new 'feature' ("Email via Google+") will also be turned on by default - if you're a Google+ user, once the feature rolls out anyone on Google's social network will be able to send messages to your inbox.
There are some restrictions, however. While the emails will go to your inbox, by default they will only reach the 'Social' tab of your Gmail and not your main inbox by default.
Google have also said that anyone emailing from G+ won't see the actual email address unless you reply.
If you don't want anyone from Google+ emailing you, you'll have to opt out of the feature by clicking on your settings tab, once the new feature rolls out.
"This feature is rolling out over the next couple of days to everyone that uses Gmail and Google+. You'll get an email with information and a link to the setting when the feature is available."