Check all of the appconfigs in the EMAIL config group (select EMAIL from the Config Groups dropdown box on the appconfig edit page in the admin section). Make sure that the mail server, username, and password are correct, and make sure that the email addresses are correct so that someone will actually get the emails. Also make sure that the SendEMailOnApplicationError appconfig is set to true. The email will be delivered to the email address configured for the MailMe_ToAddress appconfig parameter and will be sent from the MailMe_FromAddress email address. You'll probably also want to check the mail server logs of the mail server that you are using to make sure that the email coming from the local copy of the site isn't being blocked. Also check any anti-virus/firewall/network protection/monitoring software that may be installed on the local machine to ensure it's not blocking the outbound traffic.
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