Ask HN: Any Dumb Email Client for iOS and Android?

Hello, I am searching for a dumb email client: one that simply connects to my IMAP and SMTP servers (even if they're Google's servers). The ones I've tried so far (Outlook, Spark, etc.) seem to all want OAUTH access to my Google account. I don't want their servers accessing my mail, I just want a dumb email client. Any suggestions?

What's really annoying to me is that Outlook and Spark on iOS both let me setup IMAP for Fastmail, but as soon I enter `imap.gmail.com` they prompt me for OAUTH access.