I had only checked them back when they were just getting started, and encryption was still in the works. Today, encryption is built-in using #autocrypt and they offer even clients for the desktop.
Has anyone tried it?
@peter in theory yes, as if the other people don't use this app delta will fall back to plain email (it is email, after all), so can be read with any email client.
But first heed the warnings in this thread about whether this is appropriate for your threat model or not:
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