Earlier quoted context omitted.
Apple mail steadfastly refusing to permit me to see an email address so I can verify the source of an email. Truly the most cursed.
How so? You can tap the from / to fields and it shows the addresses.
At some point in time the actual email address used was flagged with a little “recent” badge - by itself a confusingly-worded tag - but even that doesn’t show up consistently.
It’s stupid because there’s really no reason to play hide and seek with the email address - that’s an identifier that people should generally be familiar with (since you have to use it reasonably often), and lots of people have multiple addresses that they can receive mail at.