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.
MacPaw is a global software development company building a digital ecosystem designed to supercharge productivity for Mac users. Founded in Kyiv with an office in Boston, MacPaw has nearly two decades of experience crafting software used by millions worldwide, including products like CleanMyMac and Setapp. MacPaw is harnessing machine intelligence through Eney, an AI-powered "Computerbeing," to empower individuals, teams, and developers driving the next generation of human-computer interaction.
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.