This file is indexed.

/etc/mail/peers/provider is in sendmail-base 8.14.4-4+deb7u1.

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

The actual contents of the file can be viewed below.

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#/etc/mail/peers/provider
#
# Sample provider file for sendmail
# used to provide ISP information (masquerade_as, smarthost, etc.)
#
# This is what I use when connecting to mindspring.com:
# remove the leading dnl to activate
LOCAL_CONFIG
dnl define(`SMART_HOST', `mail.mindspring.com.')dnl
dnl MASQUERADE_AS(mindspring.com)dnl