Most iPhone Users setup iMessage using Apple ID, which automatically makes the Email Address linked to Apple ID as the default Email Address for sending and receiving Messages on iPhone.
However, it is also possible to add another Email Address to iPhone and set it up as your preferred Contactable Address on iPhone, instead of using the Email Address Linked to Your Apple ID.
Add New Email Address to iMessage on iPhone
If you do not like the idea of your Apple ID Email Address being used for iMessages, you can add a New Email Address to the Messages App and designate this new email Address for sending and receiving iMessages on your iPhone.
Add Email Address to iMessage on iPhone
Follow the steps below to Add a New Email Address to iMessage on your iPhone or iPad.
1. Open Settings > tap on your Apple ID.
2. From Apple ID screen, go to Name, Phone Numbers, Email > tap on the Edit option.
3. Next, tap on Add Email or Phone Number option that appears.
4. On the pop-up, select Add Email Address option > type your New Email Address and tap on Next.
5. For security reasons, Apple will send a Six-digit Verification Code to your Email Account.
6. Get the Verification Code from your Email Account and verify your Email Account by entering the Verification Code.
7. Once your Email is verified, go to Settings > Messages > Send & Receive.
8. On the next screen, you will see the New Email Address that you just added under “Contactable At” section.
You can tap on the New Email in case you want to use the New Email for sending and receiving iMessages on your iPhone.