I really should just stop using them, but lack the time to sit and think a replacement through properly
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Just find an ISP that does email, that you will never use for connectivity, and that supports encrypted SMTP and IMAP and you are good.
If your country has bad rules about privacy and monitoring, choose one in another country that doesn't.
Use a carefully chosen no-log VPN service for all connections from your computer, and use Thunderbird with encrypted SMTP and IMAP, and enigmail/PGP where possible.
Biting the hand that feeds IT
