; header fields
[
  (header_field_email)
  (header_field_subject)
  (header_field)
] @keyword

(header_separator) @punctuation.delimiter

(header_subject
  (header_unstructured) @markup.bold)
(header_other
  (header_unstructured) @comment)

; Firstname Lastname
(atom) @variable

; Email Address
; currently this includes the wrapping <>, can we change this?
(email) @string

; (header_subject) @markup.heading
; (header_other) @markup.environment