Now that most SMTP connections are encrypted with STARTTLS on the wire, autocrypt is not that valuable. At an email server autocrypt can be trivially man in the middled with just a simple script. It ends up being just another encrypted messaging solution that skips the hard but crucial problem of identity.
Added: Autocrypt does not do forward secrecy. Most people want to keep their old emails, so forward secrecy wouldn't add much value:
* https://addons.thunderbird.net/en-US/thunderbird/addon/autoc...
Now that most SMTP connections are encrypted with STARTTLS on the wire, autocrypt is not that valuable. At an email server autocrypt can be trivially man in the middled with just a simple script. It ends up being just another encrypted messaging solution that skips the hard but crucial problem of identity.
Added: Autocrypt does not do forward secrecy. Most people want to keep their old emails, so forward secrecy wouldn't add much value:
* https://articles.59.ca/doku.php?id=pgpfan:forward_secrecy