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#
# Postfix access control on HELO/EHLO context.
#
# References:
# * Postfix SMTP relay and access control
# http://www.postfix.org/SMTPD_ACCESS_README.html
#
# NOTE: by default, patterns are case insensitive.
#
# Aaron LI
# 2017-08-05
#
#
# smtpd_helo_restrictions =
# permit_mynetworks,
# check_helo_access pcre:/usr/local/etc/postfix/helo-access.pcre,
# reject_non_fqdn_helo_hostname,
# reject_invalid_helo_hostname,
# reject_unknown_helo_hostname,
# permit
#
# Whitelist M$ Exchange Online Protection
# See also: https://technet.microsoft.com/en-us/library/dn163583
/^.*\.outbound.protection.outlook.com$/ OK
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