You can perform a simple search by typing your query in the Search field in Mail’s toolbar. (Command-Option-F.)
Mail will notice that when you type, it matches either a name, email address, date, subject or message header.
Click on the one that closely matches what you are looking for to narrow your search.
Let's say we select People < Mint Bills Updates < firstname.lastname@example.org
Adjust your tokens by clicking on the little arrow (as seen below):
Need to narrow your search down even further? Use multiple tokens:
If you are still not finding an email, please write to us at: email@example.com.