Message Lib instead of Mail only ?

I understand your point.
Its just that I am not quite sure that if such Message service is added, that it will be correct to have it at the same time with Email lib.

The combination will look as Mysqli and PDO(mysql) ..
Almost pointless to have them both but they are ok one with other..
And I agree that perhaps the Mail lib is too big and important feature to put just as adapter to some kind of service.

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