Did I mis-configure something, or are spammers not looking up the MX?

I'm moving DNS off of my current combination of the colo provider's servers and our own machines and onto nettica.com after a 12 hour power outage in the data center took down my boxes and their techs refused to change the DNS record to point to one of my boxes in another data center.

Here's an example of the records I've set up.

Code: 
communitydomain.net Host (A) Dynamic 127.13.135.223
communitydomain.net Mail (MX) Static 10 mail.communitydomain.net 
mail.communitydomain.net Host (A) Static 216.16.22.3 
www.communitydomain.net Alias (CNAME) Static communitydomain.net
Here's the weird thing. I've got a copy of imail on 127.13.135.223. It has no accounts associated with it, and is not set up to handle mail for communitydomain.net. Instead, it's set up to handle mail for the machine itself, colo03.mydomain.com. There is but one user account, root.

After the DNS transferred over, communitydomain.net reported no problems with email. While setting up ASPMail on 127.13.135.223, I noticed that the SMTP server was logging a massive number of incoming emails. After looking at them, they are all spam messages, addressed for communitydomain.net. The messages, however, aren't going to mail.communitydomain.net, they're going to the web server (which, of course, rejects them immediately for the lack of an account).

Do I have something misconfigured on my end? Am I just not seeing legitimate emails coming to the web server because I am looking at too small a sample? Are the spammers not doing the DNS lookup properly?

 

 

 

 

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