Heroku currently active username, How to change on Mac OSX or Linux ?!

If you are already using Heroku on your Mac or Linux with some email like me@x.com and you want change the currently active username on your Mac to other like me@y.com, you should do the following:

Humail: Mail is Emotional Again!2

Humail, an emotionally rich email client for your iPhone. Another cool app built by BadrIT hits the app store. 

No more cold rigid mail grids, It’s the time to touch, feel, personalize, your in and out posts like real mail. You can see your email messages in a 3D realistic view that shows your mail box with real metaphors, like envelopes, stamp, ...

Check all other features at the app store.