See which e-Mail adress was sent to

You have encountered one of the many limitations of the native iOS/iPadOS Mail App. When you tap the addressee’s name, the associated contact card is opened - and this may have multiple email addresses associated with it - and not the actual email address to which the mail-message was sent.

Unlike many other Mail Apps, the native Mail App doesn’t have a facility to view the raw address header that would easily identify both the sender and recipient email address.

When looking at the All inboxes category, this limitation of the Mail App is compounded - as, by definition, you are looking at all of your configured inboxes.

The only method to have confidence of the recipient email address is to view the inbox of each of your email accounts, one at a time. Your native Mail App will show each account and mailbox independently - as well as the aggregate views of All inboxes, All Drafts, All Archive, All Sent, All Bins etc.

You can enable and disable each of the available mailbox views from the Mail App sidebar. If hidden, tap the sidebar icon at top-left of the Mail App window to expose the sidebar - then tap the Edit button at top-right of the sidebar. You can now enable/disable and re-order the mailbox views to meet you needs. Tap Done when you are finished editing.