When you start a new iMessage conversation it might not originate from the phone number or Apple ID that you expect, causing confusion for the recipient. Here’s how to make sure new conversations use the correct phone number or email address.
This setting is one that has been part of iOS and macOS for years, but it’s one that might not be set up correctly by default. If you’d rather use your email address when starting a new iMessage conversation, then you will need to make sure all of your devices are configured correctly. If they’re not, you run the risk of message fragmentation at the receiving end, with people potentially having multiple conversations with the same person, but using two different numbers or email addresses.
It’s this potential for confusion that Apple has tried to prevent via multiple updates, and even though things are undoubtedly better now than they were just a couple of years ago, nothing is perfect.
Making sure that new iMessage conversations are started with a consistent number or email address is half the battle, so here’s how to make sure your devices are all on the same wavelength.
Changing the number or email address new conversations start from on iPhone and iPad
To begin, open the Settings app and tap “Messages.”
Next, scroll down and tap “Send & Receive.”
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Source : How to Change Whether New iMessage Conversations Use Your Phone Number or Email Address
