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Topic: 51 4.7.1 <mmonte@abc.net>: Recipient address rejected: International

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 99
- Deployed with iRedMail Easy or the downloadable installer? iso
- Linux/BSD distribution name and version:  centos7.6
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? easy
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
RCPT from vml927.zxy.com[173.186.244.142]: 451 4.7.1 <mmonte@abc.net>: Recipient address rejected: Intentional policy rejection, please try again later; from=<Ron.Regan@zxy.com> to=<mmonte@abc.net> proto=ESMTP helo=<vml927.zxy.com>

====
Guess I saw this as a Whitelisting event. How do I do that with the community version?

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Re: 51 4.7.1 <mmonte@abc.net>: Recipient address rejected: International

Check this tutorial to whitelist some sender server IPs or domains for greylisting service:
https://docs.iredmail.org/manage.iredapd.html