In addition to the Web UI, Kansa sends confirmation emails for various actions. Each email requires a corresponding template, i.e. a .mustache file in this directory. Not all messages may be appropriate for you, in which case removing them completely may be an appropriate method of guaranteeing that they'll never be sent.
Each template file should start with a key-value metadata section defining the from, fromname and subject values, followed by the message body. The subject and the body of the message are rendered using mustache, with values from the data object passed to the messsage handler Kyyhky by either the Kansa or Hugo server.
Once rendered, each message will be wrapped to a maximum width of 78 characters.
The email data field will be used as the message recipient address. If name is included, that will be used as the recipient name. Values for the barcode_uri and login-uri data fields will be generated by Kyyhky, provided that the key value is set. The calling server may include any additional fields; these need not have string values.
In order to format non-string values for messages or otherwise apply changes to the data, a message template may also have a corrsponding .js file, which should export a function that may freely modify the message data before processing it further. The exported function will be called with two arguments; the message data object and a wrap(prefix, string) utility function. The function should modify the input data as appropriate. If the function returns a non-empty string, that will be used as the name of the template.
For examples of what's possible, the default hugo-update-nominations message includes an indented list that is wrapped with a prefix, and the kansa-new-payment message may be rendered with the kansa-new-siteselection-token template in certain conditions.