/etc/qpsmtpd/badhelo is in qpsmtpd 0.94-2.
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 14 | # Blacklist of HELO/EHLO greetings used by the check_spamhelo plugin. This
# will have no effect unless the check_spamhelo plugin is enabled in the
# qpsmtpd plugins configuration file, /etc/qpsmtpd/plugins. It can contain
# a list of HELO greetings never used by the hosts named, but frequently
# forged by spammers (e.g. the domain names of the major webmail providers,
# your own external IP address(es), etc.)
#
# (for example:)
# yahoo.com
# excite.com
# hotmail.com
# msn.com
# aol.com
# 1.2.3.4
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