The best alternatives to MeSign app are ProtonMail, Spike, and DarwinMail π. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurreeβ The smarter, simpler way to analyze your data
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.
Skizzle is a chrome extension for Gmail that makes end-to-end encryption dead easy - No passwords to remember, share or manage - Send encrypted attachments to any Gmail address - Verify file access on a public blockchain - Generous Free Forever plan