We did a clean install of events-manager today -- on a new wp 3.3.1 install.
We've been troubleshooting this problem, because we've been getting obscure errors relating to email -- (we're not receiving any admin emails pertaining to 'pending' reservations for approval).
Basically when a logged in user attempts to "send a booking" for an event, they receive the following error (initially):
Booking successful, pending confirmation (you will also receive an email once confirmed). However, there were some problems whilst sending confirmation emails to you and/or the event contact person. You may want to contact them directly and letting them know of this error.
Errors: (only admins see this message)
Please supply a valid email format.
When this error comes up -- the "send your booking" button is still active. Pressing it a 'second' time yields:
Booking successful, pending confirmation (you will also receive an email once confirmed).
Atwhich this point, the registrant receives their pre-confirmation email (however our administrators still do not receive a notification email).
When we sign into the WP control panel -- we see 2 bookings are pending now -- one from a 'Non-Registered User' and the other from the actual user.