The best alternatives to StealthMail are MacPaw, ProtonMail, and AnyAlias. If these 3 options don't work for you, we've listed a few more alternatives below.
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MacPaw develops and distributes innovative software for macOS and iOS that simplifies the lives of Mac users. Renowned for its meticulously crafted products, such as CleanMyMac, CleanMy®Phone, Setapp, and ClearVPN, and known for its Moonlock cybersecurity division, MacPaw is dedicated to enhancing and securing the Mac user experience. Founded in Kyiv, Ukraine, with a subsidiary office in Boston, MacPaw serves millions of users worldwide.
ProtonMail was founded in 2013 by scientists who met at CERN and were drawn together by a shared vision of a more secure and private Internet. Since then, ProtonMail has evolved into a global effort to protect civil liberties and build a more secure Internet, with team members also hailing from Caltech, Harvard, ETH Zurich and many other research institutions.