/etc/bley/whitelist_clients is in bley 2.0.0-2.
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 | # Static list of recipients that do NOT want greylisting
# Entries are compatible with postgrey, ie
# 192.0.2.0/24
# example.com
# /regexp/
# NB example.com includes all subdomains of example.com, too
# regexp is applied to the client name, not the IP address
# client = remote mailserver, not sender's email address
# 10.0.0.0/8
# 172.16.0.0/12
# 192.168.0.0/16
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