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Topic: 554 Sending address not accepted due to spam filter

I am experiencing an issue where sending to this one domain we receive 554 sending address not accepted due to spam filter. Here is the output from if I telnet to the port and perform the task;

[root@pns-mail01 ~]# telnet 1.1.1.1 25
Trying 1.1.1.1...
Connected to 1.1.1.1.
Escape character is '^]'.
220 mail5.********
ehlo pns-mail01.*******
250-MAIL5.******** Hello [2.2.2.2]
250-SIZE 31457280
250-AUTH LOGIN CRAM-MD5
250 OK
mail from:<user@domainname.com>
554 Sending address not accepted due to spam filter

This is from the server. If i do the same from my desktop everything goes through okay. My IP address isn't blacklisted and neither is the receiving host. I haven't made any changes to anything except installed iRedAdmin-Pro-LDAP and this seems like the only domain this is happening to also out of atleast 30 other domains we send to.


==== Required information ====
- iRedMail version: iRedAdmin-Pro-LDAP v2
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: CentOS 6 64bit
- Related log if you're reporting an issue:
====

2

Re: 554 Sending address not accepted due to spam filter

Is the server IP address (in your telnet command, 1.1.1.1) owned by you or others? If it's owned by others, you have to contact its owner (webmaster, or postmaster) to work together to solve it.