Check out mailspring(https://www.getmailspring.com/) or Thunderbird(https://www.thunderbird.net/en-US/thunderbird/all/)
getmailspring.comMailspring — Free Email Client for Mac, Windows & LinuxMailspring is a fast, native email client for Mac, Windows, and Linux — with read receipts, link tracking, send later, grammar checking, and more. Free to download. Pro at $8/month.
I personally like Apple Mail or, for Gmail, Notion Mail or Mimestream (https://mimestream.com/).
MimestreamMimestreamA native macOS email client for Gmail