I'm looking for an email app on desktop and mobile because the Gmail website experience sucks.
There are lots of apps out there, mostly priced. But I'm worried that my data (including email texts, attachments, contacts, calendar, etc.) will be saved on third-party servers, and I already have to grapple with that issue on Gmail.
Are there any email apps that can be trusted with our data, even if they're not free?
The best arguments for a long-term mail storing solution - it keeps your emails and all your mail settings, in a form that is truly portable, so that you can easily move it from computer to computer
I am trusting it with 22 GB of emails (many tens of thousands of emails) organized in many folders.
You can have it connected to many online mail services, so it will sync (and keep an offline copy of your mail) and keep all of them separate. Or, you can configure it to sort all your email in a single place and folder hierarchy.
You can have various types of filters, separately per mail account.