16 Apr
                
                    2013
                
            
            
                16 Apr
                
                '13
                
            
            
            
        
    
                10:26 a.m.
            
        Turn on the following directives:
auth_verbose = yes auth_debug_passwords = yes
Restart, then reconnect with your mail client. You should have much better logging to determine the source of the problem.
Dem