MCSquared Mail
An email client with an assistant built in. It brings the addresses you already use into one inbox, sorts what arrives by what actually needs you, and drafts replies you review before anything is sent.
Connecting a Gmail account lets MCSquared Mail read that mailbox so your mail appears in the inbox and can be filed, and send the replies you approve. It uses that access only for the account you connect, and you can withdraw it at any time from your Google account.