Why can’t I receive emails from external domains on an internal domain?

Kyle MacDonald November 20, 2012
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I am running Zimbra 8.0 on Ubuntu 10.04 inside a virtual machine which runs on Windows 7 Professional. I have a domain “example.com” running on it using DNSMasq. I can’t receive email from either the internal domain, usera@example.com can’t receive userb@example.com’s email, or from external domains like GMail or Yahoo, usera@example.com doesn’t receive userb@gmail.com. But however I can send mail to an external domain like GMail or Yahoo, usera@example.com to usera@gmail.com, and that is successful.

Here is what I have done so far:
1. I edited my host file on Windows to tell that there is a domain at this internal IP address and domain is not out on the internet.
2. Replying to a successfully sent email back to the sender to see what errors I would receive.
3. Checked to make sure all records are correctly setup.
4. All services on Zimbra are working and running.

I believe my error lies within either not having the proper records in line with MX records and such OR needing to have my host see my internal domain differently. But I am still very new to all this so it may be something I have not thought about yet.

I know logs would be helpful to assist with helping me, please let me know which logs I need to provide.

Thank you in advance everyone who helps me out.

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