Resolve hostname to IP address for Postfix

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I'm trying to setup postfix in a VPC on AWS where an external server communicates with a postfix mail server in the same subnet.

I'm getting an error from postfix every time I try to connect to postfix from an external client. The error says:

warning: hostname example.com does not resolve to address 54.x.xxx.xxx
connect from unknown[54.x.xxx.xxx]
lost connection after CONNECT from unknown[54.x.xxx.xxx]

I'm suspecting this is related to the IP address that is being pointed to the hostname. When I run:

dig example.com

The 'answer' section outputs this:

;; ANSWER SECTION:
example.com. 60 IN  A 10.0.1.132

I've looked at this link: http://www.postfix.org/LINUX_README.html

and I've tried editing /etc/host.conf and the /etc/postfix/main.cf file from that link and a bunch of other things from googling but nothing is working and I still get the same error mentioned above.

Is there a way to configure the VPC or the EC2 instance to point to my public IP address, or can I fix this problem trying to add some more configuration settings for postfix?

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