iMessage and Beeper Android - Your Ultimate Guide
On Beeper, you can unify all the most popular chat networks in a single Inbox, including iMessage; you can message your friends, family, and colleagues through an iMessage connection on your Android device using Beeper.
How does it work?
With Beeper, you can message your iPhone user friends through iMessage, as simple as that. You can use the email of your choice as your alias, and if you still use an iPhone along with your Android and have another phone number on that iPhone, you'll be able to use it on Beeper Android as well.
Once you've setup Beeper Desktop with all your chat networks, including iMessage, your iMessage view should look like this:

If your iMessage view on Beeper Desktop looks like the image above, you canyou can use your iMessage connection on Beeper Android.
How to start chats?
To start a chat with an iMessage contact on Beeper Android, press the “Start a New Chat” button located bottom right corner.

You can search by scrolling or typing your contact's name on the following view. Once you get your contact, you'll be shown all the chat networks available to start a new chat with that contact. Select iMessage.

At this point, you can start typing your message in the text box.
How do your contacts change to your email?
You can use your email as your Apple iMessage alias or aliases if you want to use more than one.
If you don't own an Apple device, you can update this information at appleid.apple.com.
Once signed in, you want to go to Personal Information > Reachable At.

From this view, you can add the email/emails you want to use as your iMessage alias/aliases. Remember that although all email aliases will work on Beeper for iMessage, only phone numbers active on an iPhone device will.
After confirming the emails you want to use as your iMessage alias, you can tell your friends which one they could message you over iMessage. As simple as that.