This file is indexed.

/usr/lib/R/site-library/sendmailR/INDEX is in r-cran-sendmailr 1.2-1-2.

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

The actual contents of the file can be viewed below.

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mime_part               Create a MIME part
mime_part.character     Create a MIME part from a character string. If
                        the string matches a filename, a MIME part
                        containing that file is returned instead.
mime_part.data.frame    Create a MIME part from a 'data.frame'.
mime_part.default       Default MIME part method
mime_part.ggplot        Creates a MIME part from a ggplot2 plot object
mime_part.matrix        Create a MIME part from a matrix.
mime_part.trellis       Creates a MIME part from a trellis plot object
sendmail                Send mail from within R
sendmail_options        Set package specific options.