Search in Apple Mail for sender yields fewer results than are there

Hello rick7,

This page can help out with searching through your emails: Search for emails in Mail on Mac - Apple Support

Search for emails using your own words

When you click in the search field, Smart search suggestions provide recommended searches and show related content.

1. In the Mail app  on your Mac, in the toolbar, enter a phrase in the search field (if it’s not shown, click the Search button  in the toolbar).

Type what you’re looking for the same way you’d say it (this is called natural language search). Here are some examples:

from nisha

from nisha yesterday

to kevin

to kevin about remodel

flagged emails

PDF attachments

As you type, Smart search corrections improve your results by correcting typos and replacing words with useful synonyms.

2. Press Return.

Mail shows the mailboxes being searched in the toolbar above the message list. If there are no results, select one or more different mailboxes in the Mail sidebar or the Favorites bar.

3. When you’re done, click the Clear button  in the search field.

It may also help to try rebuilding the mailbox. Details on that process can be found here: Rebuild mailboxes in Mail on Mac - Apple Support

Cheers.