There's quite a bit of pingpong redirection with Nixpkgs and NixOS
manual utilities. Since devmode was lacking a README, the descriptive
text is moved there and it's referenced by both manuals.
There exist multiple issues with these options, for example they are not
introspectable, since the values are configured in the config part of the
module.
Also the keypair is always configured for both server and client usage,
which is really surprising. The postfix docs even advise against setting
up client certificates, if they aren't required. [1]
The replacements are the `smtpd_tls_chain_files` for server usage and
`smtp_tls_chain_files` for client usage, which are the prefered way to
configure keys and certificates since Postfix 3.4.0. [2]
[1] https://www.postfix.org/postconf.5.html#smtp_tls_cert_file
[2] https://www.postfix.org/postconf.5.html#smtpd_tls_cert_file
* pkgs.formats.yaml_1_2: init
Same as YAML 1.1 but relies on the unpinned remarshal version which emits
YAML 1.2.
* nixos/postfix-tlspol: init
MTA-STS and DANE/TLSA resolver and TLS policy socketmap server for
Postfix.
* nixos/tests/postfix-tlspol: init
Simple test if the service comes up and the CLI can interact with it and
gives reasonable results.
source https://mozilla-services.readthedocs.io/en/latest/howtos/run-sync-1.5.html#howto-run-sync15
Quotation:
```
Firefox for Android (“Daylight”, versions 79 and later) does support using a non-Mozilla-hosted Sync server. Before logging in, go to App Menu > Settings > About Firefox and click the logo 5 times. You should see a “debug menu enabled” notification. Go back to the main menu and you will see two options for a custom account server and a custom Sync server. Set the Sync server to the URL given above and then log in.
To configure Android Firefox 44 up to 78 to talk to your new Sync server, just set the “identity.sync.tokenserver.uri” exactly as above before signing in to Mozilla accounts and Sync on your Android device.
Important: after creating the Android account, changes to “identity.sync.tokenserver.uri” will be ignored. (If you need to change the URI, delete the Android account using the Settings > Sync > Disconnect… menu item, update the pref, and sign in again.) Non-default TokenServer URLs are displayed in the Settings > Sync panel in Firefox for Android, so you should be able to verify your URL there.
```
the /token/ prefix is experimentally wrong.
