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/usr/share/highlight/langDefs/email.lang is in highlight-common 3.41-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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Description="E-Mail treated as Markup"

Keywords={
  { Id=1,
   Regex=[[^>\s?>\s?>\s?>.+ ]]
  },
  { Id=2,
    Regex=[[^>\s?>\s?>.+]],
  },
  { Id=3,
   Regex=[[^>\s?>.+]],
  },
  { Id=4,
   Regex=[[^>.+]],
  },
  { Id=4,
    Regex=[[ <.+@.+> ]],
  },
}

IgnoreCase=false

Digits = [[ \*\*.+?\*\*|\*.+?\*|_.+?_ ]]

Identifiers = [[ [a-zA-Z]\\w* ]]