Yes, the user send the screenshot with To address is filled. I also noticed Bcc/Cc was showing but no From address there. This is also possible if the user has only one email account setup. I did not find this issue on the devices I have.The user using iPhone 6 iOS v12.4.2, To: address is set, he also said that he could use the email from the mail App.
jaffmd
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He is using the mail app which is given by Apple.
If there are more than one account, the from address will display. Otherwise it will not show from address.And he is able to send email normally from Mail app. If he has any mail he will tap reply and send the message.
Is it like me having two keys for same subscription?
Ok I will have to do as you suggested.