I use K9 Mail[1] with Fastmail and I have no complaints at all. 1: https://f-droid.org/repository/browse/?fdfilter=K9&fdid=com.fsck.k9 https://f-droid.org/repo

I use K9 Mail[1] with Fastmail and I have no complaints at all. 1: https://f-droid.org/repository/browse/?fdfilter=K9&fdid=com.fsck.k9 https://f-droid.org/repository/browse/?fdfilter=K9&fdid=com....