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Topic: 550 #5.7.1 Your access to submit messages to this e-mail system...

====- iRedMail version (check /etc/iredmail-release): 0.9.4
- Linux/BSD distribution name and version: Debian 8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue:
====

Hello,
Anybody, tell me what just that mean?

This is the mail system at host mail.MY-DOMAIN

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

<RECIPIENT@RECIPIENT-DOMAIN>: host mail1.RECIPIENT-DOMAIN [RECIPIENT-IP] said:
    550 #5.7.1 Your access to submit messages to this e-mail system has been
    rejected. (in reply to RCPT TO command)
Reporting-MTA: dns; mail.MY-DOMAIN
X-Postfix-Queue-ID: E185661A7A
X-Postfix-Sender: rfc822; ruslan@MY-DOMAIN
Arrival-Date: Wed, 17 Feb 2016 16:31:55 +0300 (MSK)

Final-Recipient: rfc822; RECIPIENT@RECIPIENT-DOMAIN
Original-Recipient: rfc822;RECIPIENT@RECIPIENT-DOMAIN
Action: failed
Status: 5.0.0
Remote-MTA: dns; mail1.RECIPIENT-DOMAIN
Diagnostic-Code: smtp; 550 #5.7.1 Your access to submit messages to this e-mail
    system has been rejected.

the recipient mailserver found my IP in blacklists? or what?

----

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Re: 550 #5.7.1 Your access to submit messages to this e-mail system...

itruslan wrote:

<RECIPIENT@RECIPIENT-DOMAIN>: host mail1.RECIPIENT-DOMAIN [RECIPIENT-IP] said:
    550 #5.7.1 Your access to submit messages to this e-mail system has been
    rejected. (in reply to RCPT TO command)

It just says your email was rejected, but no detailed reason. so it's not clear why it was rejected. You have to contact its mail system admin to figure it out. Maybe send email from another email address (e.g. gmail, hotmail, etc).