/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.
1 2 3 4 5 6 | # 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.
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