rDNS and email on VPS

I have the following config on my vps.

Hostname is: powervps.mydomain.com

Then, I have an account setup for my website: mydomain.com

If I do an rDNS for my IP (which is set to mydomain.com), I get the powervps.mydomain.com

Heres the problem. If I send email from support@mydomain.com it doesn't get delivered or it goes straight to bulk mail.

However, if I send it from support@powervps.mydomain.com it goes through fine and does not get sent to the junk folder.

Anyone have any clue why this would be? Its almost like the server is doing an rDNS and seeing the powervps and only delivering properly if there is an exact match.

Thanks,
Jason

 

 

 

 

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