Email field as username for clients to login outside of the domain? or Where is the user authentication ldap string?

Email field as username for clients to login outside of the domain? or Where is the user authentication ldap string?

I am attempting to look through the flat files and db for the authentication string used in the SelfService portal by manageengine in order to supplement a client need to use email address' from AD/LDAP to log in to the self service portal.  

Has anyone successfully used the email field as a means to login in the selfservice application or was able to find the authentication string in the db in order to be modified?  I suspect like many applications the authentication string is simply a pointer to the ldap like many other application built using x.500. 


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