I apologise if this has been asked before, but I can't find anything with the search on here or on Google. Is there a list of all the error states that Zimbra could output dependent upon certain criteria not being met?

An example of one I got back recently is :
ERROR: service.INVALID_REQUEST (invalid request: Cannot add self as a member: username@domain.com)
I know that is a primitive example, however it would be very helpful to know what other error messages could be received.

I appreciate any replies.