Kerberos Mail Authentication

Hope someone can help. I am new to kerberos and Open directory but was able to get my clients to authenticate to the server using afp yet I am getting errors trying to get the mail clients to authenticate. This is the error from the server log: Jul 27 11:02:20 localhost krb5kdc[349]: TGS_REQ (7 etypes {18 17 16 23 1 3 2}) 192.168.0.3: UNKNOWN_SERVER: authtime 1154019426, adamp@WWW.PROSEPS.COM for pop/mail.proseps.com@WWW.PROSEPS.COM, Server not found in Kerberos database Jul 27 11:02:20 localhost pop3[692]: Major Error (1): A token was invalid (gss_accept_sec_context) Jul 27 11:02:20 localhost pop3[692]: Minor Error (1): Token header is malformed or corrupt (gss_accept_sec_context) Jul 27 11:02:20 localhost pop3[692]: Major Error (1): A token was invalid (gss_accept_sec_context) Jul 27 11:02:20 localhost pop3[692]: Minor Error (1): Token header is malformed or corrupt (gss_accept_sec_context) Jul 27 11:02:22 localhost pop3[655]: badlogin: [192.168.0.3] GSSAPI Again kerberos afp authentication works yet the mail authentication does not. I hope I am not giving any proprietary info by showing this log. I am new to server admin. Any help would be great.