iOS: 12.2

In the iOS Mail app, if the sender or recipient of an email has more than one email address associated with it, how can I tell which specific email address was used? For example, if I send myself an email from my personal account to my work account, since they're both associated to the same contact, I can't figure out how to tell who the recipient actually was. I have both Short Names and Prefer Nicknames turned off in the Contacts preference.