Open attachment that contains forwarded email (MIME type message/rfc822) When I forward an email with Mutt from my laptop, Mutt adds the forwarded email as an attachment with MIME type &quot;message/rfc822&quot;.
Unfortunately, Android's stock email client &quot;com.android.email&quot; version 8.1.0 displays the received email like this:

Two things are wrong with that:

It doesn't show the forwarded email's content.
It doesn't show the content of the non-forwarded email, the body of the email I wrote in Mutt.

The email displays properly when using K-9 Mail.
Is there a way to make the email app show the email and its attachment?

I'm on a Samsung Galaxy J5 running LineageOS.
Gmail cannot support this as I understand from FairEmail discussion on XDA (outlook mail client has related limitations).
There is a workaround, in case one is willing to have the forwarded email as text and not attachment.
OP had set mime_forward because they wanted to forward attachments per default
. If this is unset as per mutt documentation (to ask-no or ask-yes), the forwarded email is just text (not a message/rfc822) and the stock email app shows it fine as confirmed by them.