This file is indexed.

/etc/ssmtp/revaliases is in ssmtp 2.64-8ubuntu2.

This file is owned by root:mail, with mode 0o640.

The actual contents of the file can be viewed below.

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# sSMTP aliases
# 
# Format:	local_account:outgoing_address:mailhub
#
# Example: root:your_login@your.domain:mailhub.your.domain[:port]
# where [:port] is an optional port number that defaults to 25.