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See the spam score for an email sent with these settings: https://www.mail-tester.com/test-jy6unbdzu Tests done: 1. Install the email app with version 4, then check out the files: ``` ls -la /var/lib/rspamd/dkim/ ; cat /etc/rspamd/local.d/dkim_signing.conf total 4 dr-x------ 1 _rspamd _rspamd 50 Jan 1 19:14 . drwxr-x--- 1 _rspamd _rspamd 16936 Jan 1 20:21 .. -r-------- 1 root root 1704 Jan 1 19:14 freedombox.local.dkim.key cat: /etc/rspamd/local.d/dkim_signing.conf: No such file or directory ``` 2. Apply the patches and update the app: ``` ls -la /var/lib/rspamd/dkim/ ; cat /etc/rspamd/local.d/dkim_signing.conf total 4 dr-x------ 1 _rspamd _rspamd 50 Jan 1 19:14 . drwxr-x--- 1 _rspamd _rspamd 16936 Jan 1 20:22 .. -r-------- 1 _rspamd _rspamd 1704 Jan 1 19:14 freedombox.local.dkim.key allow_username_mismatch = true; sign_authenticated = true; use_domain = "header"; domain { freedombox.local { path = "/var/lib/rspamd/dkim/freedombox.local.dkim.key"; selector = "dkim"; } } ``` 3. Configure example.com as a domain under Name Services, then also change the primary domain in the email app and confirm it completes without errors. Also see: ``` ls -la /var/lib/rspamd/dkim/ ; cat /etc/rspamd/local.d/dkim_signing.conf total 8 dr-x------ 1 _rspamd _rspamd 90 Jan 1 21:15 . drwxr-x--- 1 _rspamd _rspamd 16936 Jan 1 21:17 .. -r-------- 1 _rspamd _rspamd 1704 Jan 1 21:15 example.com.dkim.key -r-------- 1 _rspamd _rspamd 1704 Jan 1 19:14 freedombox.local.dkim.key allow_username_mismatch = true; sign_authenticated = true; use_domain = "header"; domain { example.com { path = "/var/lib/rspamd/dkim/example.com.dkim.key"; selector = "dkim"; } } ``` 4. Uninstall the app and perform a fresh install, confirm it completes succesfully. The configurations in /etc/rspamd/local.d/dkim_signing.conf have been verified to work on a throw-away VPS setup. Once merged, this should be mentioned here: https://discuss.freedombox.org/t/solved-email-messages-not-signed-with-dkim/2387 Signed-off-by: Benedek Nagy <contact@nbenedek.me> [sunil: Add comment explaining allow_username_mismatch option] [sunil: Drop an unused variable, added docstrings] Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org> Reviewed-by: Sunil Mohan Adapa <sunil@medhas.org>