Reverse DNS ESMTP Problem

[Maku]

I am using Parallels Plesk Panel 9.5.4

I am using one (1) IP address to host three (3) Domains.

Everything is working fine except for the mail system. Whenever I check the settings thru mxtoolbox.com this error shows up

220 expertsonlive.com.ar ESMTP Postfix
Reverse DNS FAILED! This is a problem.

0 seconds - Good on Connection time
Not an open relay.
0.874 seconds - Good on Transaction time


Session Transcript:
HELO please-read-policy.mxtoolbox.com
250 expertsonlive.com.ar [140 ms]
MAIL FROM: <[email protected]>
250 2.1.0 Ok [156 ms]
RCPT TO: <[email protected]>
450 4.7.1 Client host rejected: cannot find your hostname, [64.20.227.133] [140 ms]
QUIT
221 2.0.0 Bye [140 ms]

What should I do? I have tried searching for answers for almost 12 hours to no avail. I still don't get the PTR fix. I tried removing the PTR and still to no avail.

 

[IgorG]

Are you sure that hostname expertsonlive.com.ar is correctly configured?

For example:

$ whois expertsonlive.com.ar
whois: ar.whois-servers.net: no address associated with name

$ host expertsonlive.com.ar
expertsonlive.com.ar has address 93.189.37.101
expertsonlive.com.ar mail is handled by 10 mail.expertsonlive.com.ar.

But no PTR record for this IP:

$ host 93.189.37.101
Host 101.37.189.93.in-addr.arpa. not found: 3(NXDOMAIN)

 

[Maku]

I have set a PTR in the DNS Settings. Here is my DNS Settings for the main domain.

I am still wondering why the PTR doesnt work.