For everyone having Contact Us problems ... turn on Email Archiving in Admin->Configuration->Email Options.
Then download and install the Email Archive Viewer from the downloads area.
Now you can view your email history in Admin->Tools->Email Archive Viewer.
This gives you two benefits:
a) you can see the emails you're "missing out on"
b) you have proof that Zen Cart delivered the email to your mailserver. Any subsequent failure on delivery is a result of some spam filter or other such block.
At the very least, you have a bandage workaround.
Alternatively, make sure your contact-us pulldown list setting is blank, as some servers have a hard time properly delivering after splitting up the components.
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