not receiving alerts

I'm not receiving alerts on red and yellow's.  I set up my server a while
ago and received many alerts during setup and even after.  But about a week
ago I stopped receiving the emails.  They're not going to spam, and I am
able to send emails via command line from the Xymon server with no trouble.
 I've looked in the logs and am not seeing anything.  Xymon is running on
an Ubuntu v13 box hosted on AWS.  Ideas?

Thank you.
*Kris Springer*

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