==== Required information ====
- iRedMail version: latest and greats version
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  My SQL
- Web server (Apache or Nginx): Nginx
- Linux/BSD distribution name and version: Ubuntu 14
- Related log if you're reporting an issue: IP FOUND IN DNSRBL (please check for IP address listing on common DNS RBL
    services) (in reply to MAIL FROM command
====

***Error***

This is the mail system at host mx.rapid-it.co.uk.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<m_hennah@btinternet.com>: host mx.bt.lon5.cpcloud.co.uk[65.20.0.49] said: 522
    IP FOUND IN DNSRBL (please check for IP address listing on common DNS RBL
    services) (in reply to MAIL FROM command)

Reporting-MTA: dns; mx.rapid-it.co.uk
X-Postfix-Queue-ID: 5471461C49
X-Postfix-Sender: rfc822; mathew.hennah@rapid-it.co.uk
Arrival-Date: Mon, 30 Mar 2015 13:19:21 +0100 (BST)

Final-Recipient: rfc822; m_hennah@btinternet.com
Original-Recipient: rfc822;m_hennah@btinternet.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx.bt.lon5.cpcloud.co.uk
Diagnostic-Code: smtp; 522 IP FOUND IN DNSRBL (please check for IP address
    listing on common DNS RBL services)