/etc/whereami/mail-relay.conf is in whereami 0.3.34-0.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # Configuration file for setmailrelay of whereami
#
#
# The DEFAULT_RELAY sets the fallback for the mailserver to relay through
#
#DEFAULT_RELAY=mail.myplace.org
#
#
# The MAIL_SERVER chooses between sendmail, postfix and exim. If you omit
# this the system will choose the one it first finds a configuration file
# for, which is normally a safe approach.
#
#MAIL_SERVER=sendmail
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