==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.1 MARIADB edition.
- Deployed with iRedMail Easy or the downloadable installer? downloadable
- Linux/BSD distribution name and version: Ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL / MariaDB
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Dear All,

Thanks you for make live easier with the iRedMail.

I got problem that mail rejected that actually valid email.

Log from maillog :
Mar 18 15:06:54 mail postfix/smtpd[11340]: NOQUEUE: reject: RCPT from server02.domain.net[xx.xx.xx.x]: 554 5.7.1 <myuser@domain.com>: Recipient address rejected: Blacklisted; from=<SRS0=5BSKCJ=IQ=domainsender.com=someone@domain.net> to=<myuser@domain.com> proto=ESMTP helo=<server02.domain.net>

Log from iredapd.log :
Mar 18 15:06:54 mail iredapd [xx.xx.xx.x] RCPT, srs0=5bskcj=iq=domainsender.com=someone@senderdomain.net -> myuser@mydomain.com, REJECT Blacklisted [sasl_username=, sender=srs0=5bskcj=iq=domainsender.com=someone@senderdomain.net, client_name=server02.domainsender.net, reverse_client_name=server02.domainsender.net, helo=server02.domainsender.net, encryption_protocol=TLSv1.2, encryption_cipher=ECDHE-RSA-AES256-GCM-SHA384, server_port=25, process_time=0.0572s]

Can someone please help me to solve this issue.
Thank you for sharing.

Regards,
Ralfino.