[thimp]

Yeah good question. I do a lot of email on planes and travel where there is no internet. In fact I refuse to use any software that isn’t offline first these days.

I was a Fastmail customer for many years but moved to apple’s iCloud+ when they introduced custom domain support as that works entirely offline on all my devices. Also that gives iPhone/mac integrated contacts and calendars with zero hassle that actually syncs to everything properly. It’s cheaper per seat as well (£25 a month for that plus Apple Music for 6 people a month). No brainer.