I'm attempting to install a new release of a managed package in a production org and the install is failing with the following error:

Error Message: The post install script failed.

I should also be receiving an exception e-mail sent to the "Notify on Apex Error" user for the managed package as configured in the source org.  However, I'm not receiving that e-mail.  The apex user is active and has a valid e-mail address and I do get other apex exception e-mails to that address but the post-install exceptions aren't being sent apparently.  I've verified these aren't being caught as spam as well.

Anything else I'm missing?

Thanks,