[rbc]

I run email for myself with OpenBSD. The only spam mitigation is spamd(8) in blacklist mode, using nixspam. DKIM isn't checked for inbound mail. Outbound email is signed using the opensmtpd-filter-dkimsign package. There's some spam that makes it through, but not enough to take additional measures.

I also skipped using IMAP or POP3. There's a mail server with global IP addresses, that forwards inbound mail to my local workstation over WireGuard. My email clients read mail directly from /var/mail. Remote email access is via ssh terminal sessions. Not for everyone, but that's what I do.

[mekster]

Do you run a ssh terminal on phone to read email? I suppose it takes a few steps to attach a file from the phone.

[rbc]

I don't. A laptop is used for email when needed.