I once told alibaba.com the email of one of the servers with iRedMail, but the letters for some reason did not come.
In the logs /var/log/mail.log saw the following message:
postfix/smtpd: NOQUEUE: reject: RCPT from out171-234.dm.aliyun.com[18.104.22.168]: 451 4.7.1 email@example.com: Recipient address rejected: Intentional policy rejection, please try again later; firstname.lastname@example.org email@example.com proto=ESMTP helo=
In the MySQL database “iredapd”, in the table “greylisting_tracking” saw many entries with alibaba.com.
If you wish, you can disable the greylisting plug-in by opening the configuration file:
sudo nano /opt/iredapd/settings.py
And removing “greylisting” in the line:
plugins = [..., ..., ...]
You will need to reboot iredapd to apply the changes:
sudo service iredapd restart
But I added the alibaba.com domain to the “greylisting_whitelist_domains” table and the letters immediately began to come up, the SQL example:
use iredapd; INSERT INTO `greylisting_whitelist_domains` (`id`, `domain`) VALUES (NULL, 'alibaba.com');
To view the list of domains in the white list, use the command:
cd /opt/iredapd/tools/ python greylisting_admin.py --list-whitelist-domains
See also my article:
White and black list iRedAdmin