Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
You Can Now Use iMessage On Android Thanks To iMessage Chat
A new app has appeared on the Google Play store called iMessage Chat, the app allows you to use the iMessage service on your Android device meaning that your can message and Mac or iOS device for free.
The app does work fine if you are wanting to use your Android device to communicate with your friends and family on iMessage but what is happening behind the scenes is were things could become risky.
The app makes is look like the messages are being sent from a Mac mini.
Before everyone starts getting excited over iMessage being available on Android be aware that multiple developers have expressed their concern about the app having security issues.
SourceGoogle Play Store