Not looking for a server as I use fastmail currently but a client would be nice. I am currently using spark on iOS and Mac OS and just fastmail website on my Linux desktop. I’m realizing spark is nothing special and would rather not renew my subscription.
Thank you for great information! Yeah I let spark sucker me into their nice apps when I was using Gmail. I’ve since “degoogled” myself as well as removed my reliance on majority iCloud services with my own cloud services. So abandoning spark and changing my info should suffice. So yeah I am ditching them asap.
I wasn’t sure if there was a client like roundcube which I’m looking into now, that works and looks good both on desktop and mobile. I do understand now that might not be a 1 app solution. Roundcube could be a good webmail for desktop and mobile but I’d likely want an official desktop and mobile app that isn’t spark and doesn’t store my info. I’ll take a look at the other 2 you mentioned in your other comment.
The other two are also webmails. If you’re looking for native apps: