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max2

macrumors 603
Original poster
May 31, 2015
6,421
2,044
I would really love this feature in a email app.
 
You might want to try to reach out the developers of Airmail, Spark or Email by Easylido they have quite a few advanced features onboard especially Airmail.

Apple's own Mail app does support it though as Brian Baughn also indicated below.
See e.g. this and this to read more about it.
 
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