This file is indexed.

/etc/email-addresses is in exim4-config 4.89-2+deb9u3.

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

The actual contents of the file can be viewed below.

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# This is /etc/email-addresses. It is part of the exim package
#
# This file contains email addresses to use for outgoing mail. Any local
# part not in here will be qualified by the system domain as normal.
#
# It should contain lines of the form:
#
#user: someone@isp.com
#otheruser: someoneelse@anotherisp.com