Canon Authorized Sen for ImageRUNNER Machines Version 4.1 - Manual (Page 75)

Authorized Send Installation and Configuration Guide for imageRUNNER Machines 75
3. Select the authentication method from the Method drop-down list.
[Kerberos]:
The machine communicates directly to Active Directory.
[NTLM]:
The machine communicates directly to Active Directory.
[Simple]:
Necessary, if you use Domino or eDirectory for authentication.
[Anonymous]: Authorized Send will not use any user login credentials to search
the address book for e-mail addresses.