Question : reason: 554 5.7.1 Rejected [IP address] SPAM Not Welcome here

I don't know why even some simple text messages are bounced back as SPAMs from our email server?. We installed Spamassassin 2.42-3. Clients are complaining abt keep getting bounced emails. We are not receiving them. I am new to this.

I attached one of the bounced email.
------------------------------------------------------------------------------------------

From: Mail Delivery Subsystem
Date: Tue Sep 14, 2004 10:56:02 AM bla bla
To:
Subject: Returned mail: see transcript for details

The original message was received at Tue, 14 Sep 2004 10:55:56 -0400
from xx.yy.zzz.net [IP Address]

----- The following addresses had permanent fatal errors -----

(reason: 554 5.7.1 Rejected [IP address] SPAM Not Welcome here)

----- Transcript of session follows -----
... while talking to mail.domian2.org.:

MAIL From:

<<< 554 5.7.1 Rejected [IP address] SPAM Not Welcome here
554 5.0.0 Service unavailable
Reporting-MTA: dns; xx.yy.zzz.net
Received-From-MTA: DNS; xx.yy.zzz.net
Arrival-Date: Tue, 14 Sep 2004 10:55:56 -0400

Final-Recipient: RFC822; [email protected]
Action: failed
Status: 5.7.1
Diagnostic-Code: SMTP; 554 5.7.1 Rejected [IP address] SPAM Not Welcome here
Last-Attempt-Date: Tue, 14 Sep 2004 10:56:02 -0400
-------------------------------------------------------------------------------------------------

Why even simple messages get bounced back? Any way to prevent it?

Thanks

Answer : reason: 554 5.7.1 Rejected [IP address] SPAM Not Welcome here

Since it was Charter's servers that blocked the message before they made it to your mail server, there's nothing that you could do with your config to affect that other than arrainging for mail to be delivered directly to your server and bypass Charter.