mailserver trouble

I m in a shared hosting

WHM 10.8.0 cPanel 10.8.1-S31
RedHat 9 i686 - WHM X v3.1.0

It is now about 2 weeks i have problems with tha mail server

The server stop responding without any reason.

I f i test it from dnsstuff.com I receive

[Could not connect: Could not connect to mail server (connection refused by remote mailserver). <B>NOTE</B>: Per the RFCs, mailservers are allowed to continuously retry this server until it is back online, and <I>not</I> try other MX records (<A HREF="http://www.DNSstuff.com/pages/rfc2821.htm">RFC2821</A> 3.9).]


If i logon to WHM and restart the service everything is Ok, mailserver working for sometime and than stops again

any idea about this?

 

 

 

 

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