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> also sends gray bubbles

Incoming messages are _always_ gray on iOS, irrespective of the use of iMessage or SMS. Your solution is not any different in this regard.

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Okay so I actually Google image searched this, unlike everyone else here. It looks like in iMessage for business, the phone’s user’s outbound messages show as dark grey (as opposed to normal iMessage and SMS/RCS which show outbound messages as blue and green respectively).
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I’ve never seen a gray bubble and have received incoming messages from all different types of accounts
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Then there’s a misunderstanding here. I have an iPhone. When I open my Messages app and view a conversation with someone with an iPhone, my outbound messages are blue and their messages to me are gray. When I open a conversation with a non-iPhone user, my outbound messages are green and their messages to me are still gray. Are you sure you’ve never received a incoming gray message? Because that doesn’t seem possible, unless you’re talking about something other than what I and the person you responded to are talking about.

As far as I can tell, the OP’s insistence that their service won’t send gray messages seems entirely disconnected from reality.

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[delayed]
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Incorrect.
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