There are complementary technologies which largely address the key exchange problem, such as RFC-7929: https://tools.ietf.org/html/rfc7929 https://tools.ietf.o

There are complementary technologies which largely address the key exchange problem, such as RFC-7929: https://tools.ietf.org/html/rfc7929 https://tools.ietf.org/html/rfc7929 This is already supported by email providers like Posteo since 2015: https://posteo.de/en/blog/new-posteo-public-key-directory https://posteo.de/en/blog/new-posteo-public-key-directory They also recently added support for Autocrypt itself, as linked above.