HELO/EHLO domain is invalid....!!??

[x-man]

Hi,
after some of last cPanel updates I have this problem on my server and I don`t know how to fix this problem...

Every time when I try to send some message I have this error:
554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid.

Also in logs I can see:
no host name found for IP address

In WHM for exim config I have disabled "Require incoming SMTP connections to send HELO before MAIL " but this problem STILL exist!!!

Somebody know how to fix this?

Some users contacting me last few days because of this problem...

Thanks.

[x-man]

Somebody know what can be problem?

What is new, what I must check...?

Somebody with timilar problem?

Thanks.

[larryl]

Make sure that the server name and the IP address match in DNS and reverse DNS.