this is due other apps implementaion.
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I love the response "this is due to other apps implementation" when they are referring to the niche, hardly used apps created by that small software company called Microsoft. I think not working properly with Microsoft Office is an issue worth looking into!
Airmail is so nearly great, but I still run with Mail open in parallel to get round these sorts of issues. The other one is writing mails on a plane on Airmail- and then watching them get totally stuck in the Outbox