[BlueOnyx:08729] Email error trying to delete a site

[Mark E. Levy]

Trying to delete a web site, I'm getting the following: 

Sorry, an error occurred while trying to create an email server map file. If mail server configuration files were removed or manually modified, please restore the original versions and try again. 
cantDeleteEmailAlias 

I haven't changed any of the files in this site. I've tried removing the alias and disabling email for the site, but the error persists. How can I delete this site? 

Thanks, 
mark 
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