I mean, MS Outlook is ugly and I don't like the usability, but I use my mac for work, and I need to use a client. Is that safe to use mac os client as working e-mail client? Does it backup something to iCloud? I want to be sure that everything I receive stays on my laptop and isn't distributed anywhere outside. At least at the same extent if I'd used Outlook. Thank you.
UPDATE: Thank you guys, I got enough explanations. I tried embedded mail-client, and I like it more. I unchecked "Mail" in iCloud settings to be sure ))