==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.1 MARIADB edition
- Deployed with iRedMail Easy or the downloadable installer? No
- Linux/BSD distribution name and version: CentOS 7.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
NOQUEUE: reject: RCPT from unknown[11.111.111.111]: 451 4.7.1 <user01@examp01.com>: Recipient address rejected: Intentional policy rejection, please try again later; from=<test@example02.com> to=<user01@example01.com> proto=ESMTP helo=<xyz.com>
====
I got this issue after the relay to the mail security device from mail server and after the spf whitelist greylist the sender domain ,this issue is resolved (https://forum.iredmail.org/topic14517-r … try-a.html) .

I think it's not the solution . We can't know which domain is sending mail to us and it will happen again at that time.( International policy rejection)

Before the relay to the mail security device, this issue isn't existing and don't need to spf whitelist greylist the sender domain.

Any suggestion on this issue ?