How to exchange encrypted messages between DC and another email client

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See related topic:

Is it possible to communicate with non-DC user? (interoperability with email)

thanks. now I experimented with k9 mail and discovered that following steps allow to initiate an unencrypted communication (when only email address is available, without keys), then upgrade to e2ee via Autocrypt as in https://docs.autocrypt.org/examples.html disclaimer to the best of my knowledge Autocrypt doesn’t aim to prevent active attacks. you should do key verification. out of band verification = good in-band verification = bad instructions in https://…