Mail problems: Domain of sender does not exist?

Hi, I am trying to send mail from my rackshack server and they are not being accepted by aol as well as other ISPs. I checked my mail logs in WHM and have noticed a bunch of errors that run along these lines:

Domain of sender address nobody@machinename.domainname.com does not exist

550 REQUESTED ACTION NOT TAKEN: DNS FAILURE

and a very pointed error:

all relevant MX records
point to non-existent hosts: it appears that the DNS
operator for this domain has installed an invalid MX
record with an IP address instead of a domain name
on the right hand side

Problems is, I didn't set up my mail servers and so am unsure what file to check my MX records in.

Can anyone help?

 

 

 

 

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