/usr/share/vim/vim80/ftplugin/gitsendemail.vim is in vim-runtime 2:8.0.1453-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | " Vim filetype plugin
" Language: git send-email message
" Maintainer: Tim Pope <vimNOSPAM@tpope.org>
" Last Change: 2009 Dec 24
runtime! ftplugin/mail.vim
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