The Gmail app supports POP, IMAP, MS Exchange, and (though it got bugged into re-downloading the entire mailbox every day) even old-fashioned MS ActiveSync.
You can disable the Gmail app and install something like Thunderbird seeing as this is just a normal Android phone (which, of course, will also show you your Gmail emails if you set it up to do so).
You can disable the Gmail app and install something like Thunderbird seeing as this is just a normal Android phone (which, of course, will also show you your Gmail emails if you set it up to do so).