I signed up to test the email hosting and setup almost everything. Now I'm trying to rollback the entire process but when I disable Mail Hosting I get errors from the mails sent to my domain. I've already set the MX Entry in my Cpanel to default.

1. This message was created automatically by mail delivery software.
2. 
   
3. A message that you sent could not be delivered to one or more of its
4. recipients. This is a permanent error. The following address(es) failed:
5. 
   
6.   exchange@fiel.pt
7.     SMTP error from remote mail server after RCPT TO:<exchange@fiel.pt>:
8.     host mx.zohomail.com [72.5.230.114]: 553 Relaying disallowed
9. ------ This is a copy of the message, including all the headers. ------
10. 
    
11. Return-path: <xxxxxx@gmail.com>
12. Received: from mail-qc0-f169.google.com ([209.85.216.169])
13.         by filter2.cleanmx.pt with esmtps (TLSv1:RC4-SHA:128)
14.         (Exim 4.82)
15.         (envelope-from <xxxxxxx@gmail.com>)
16.         id 1WUaqO-0004FN-3G; Mon, 31 Mar 2014 12:57:37 +0100
17. Received: by mail-qc0-f169.google.com with SMTP id i17so8825194qcy.14
18.         for <multiple recipients>; Mon, 31 Mar 2014 04:57:38 -0700 (PDT)

I need urgent help please.

Thank you