Autocrypt-capable MUAs level 1 implementation status

Last updated: 2024-11-17

Note that the below table is not complete and not up-to-date. Many more mail user agents support at least a subset of Autocrypt.

You are very welcome to submit a PR to update the below information, thanks!

MUA/project	header parsing	keygen	peer state	header inject	recommend	encrypt	setup message	setup process	gossip	uid decorative
delta.chat	✔	✔	✔	✔	✔	✔	✔	✔	✔	✔
evolution	✔	✘	✘	✔	✘	✔	✘	✘	✘	✘
thunderbird	✔	✔	✘	✔	✔	✔	✘	✘	✔	✘
K-9 Mail	✔	✔	✔	✔	✔	✔	branch	branch	✔	✔
Mutt	✔	✔	✔	✔	✔	✔	✘	✔	✔	✔
Neomutt	✔	✔	✔	✔	✔	✔	✘	✔	✔	✔
Letterbox	✔	✔	✔	✔	✔	✔	✘	✔	✘	✔
Balsa	✔	✘	✔	✔	✔	✔	✘	✘	✘	✔
notmuch	branch	✘	✘	✘	✘	✘	✘	✘	✘	✔
mailpile	✔	✔	✘	✔	✘	✘	✘	✘	✘	✔
gmime	≥3.0.4	N/A	N/A	≥3.0.4	N/A	N/A	✘	✘	✘	✔
Emacs	✔	✔	✔	✔	✔	✔	✘	✘	✘	✔
FairEmail	✔	✔	✔	✔	✘	✔	✘	✘	✘	✔
Ltt.rs	✔	✔	✔	✔	✔	✔	✔	✔	✘	✔

Logos are copyright their respective owners.

Legend:

• MUA/project: denotes a mail app, library or tool.

• header parsing: compliant parsing of the Autocrypt header

• keygen: secret key generation follows Autocrypt UI guidance

• peerstate: state is kept according to spec

• header inject: proper creation of outgoing Autocrypt header

• recommend: implements Autocrypt recommendation

• encrypt: encrypts outgoing messages properly

• setup message: proper generation and processing of Autocrypt Setup Message

• setup process: follows guidance with respect to Autocrypt account setup

_ gossip: sends out Autocrypt-Gossip headers

• uid decorative: UID in key data is only used for decorative purposes, and in particular not for looking up keys for an e-mail address.

For developers

Source code:

• K9 code

• Delta.Chat code

• Mutt code

• Neomutt code

• Letterbox code

• Notmuch/Alot: TODO

• FairEmail code