LuxSci is top notch. It's expensive if you only use it for one or two accounts, but can be cheaper than FastMail if you have several accounts sharing your disk

LuxSci is top notch. It's expensive if you only use it for one or two accounts, but can be cheaper than FastMail if you have several accounts sharing your disk quota. Runbox is probably as privacy-respecting as you can get without delving into the kind of zero-knowledge encryption schemes that make Protonmail and similar services incompatible with IMAP/POP. Their webmail is meh, but that won't matter if you usually access your mail via IMAP/POP.