Question about PAM + POP3

[Alex Wang]

hi~ guys, have you ever had the experience about using PAM and POP3 to authenticate the users? I have configured the radiusd.conf and gotten the error message as follow:   rad_recv: Access-Request packet from host 140.134.21.166:3228, id=6, length=58         User-Name = "[EMAIL PROTECTED]"         User-Password = "chyu" modcall: entering group authorize for request 6   hints: Matched DEFAULT at 63   modcall[authorize]: module "preprocess" returns ok for request 6   modcall[authorize]: module "chap" returns noop for request 6 rlm_eap: EAP-Message not found   modcall[authorize]: module "eap" returns noop for request 6     rlm_realm: No '@' in User-Name = "guest28", looking up realm NULL     rlm_realm: No such realm "NULL"   modcall[authorize]: module "suffix" returns noop for request 6     users: Matched DEFAULT at 1   modcall[authorize]: module "files" returns ok for request 6   modcall[authorize]: module "mschap" returns noop for request 6 modcall: group authorize returns ok for request 6   rad_check_password:  Found Auth-Type PAM auth: type "PAM" modcall: entering group authenticate for request 6 pam_pass: using pamauth string <radiusd-fcums1.dat> for pam.conf lookup pam_pass: function pam_authenticate FAILED for <guest28>. Reason: Module is unknown   modcall[authenticate]: module "pam" returns reject for request 6 modcall: group authenticate returns reject for request 6 auth: Failed to validate the user. Login incorrect: [guest28/chyu] (from client sean port 0) Delaying request 6 for 1 seconds Finished request 6 Going to the next request --- Walking the entire request list --- Waking up in 1 seconds... --- Walking the entire request list --- Waking up in 1 seconds... --- Walking the entire request list --- Sending Access-Reject of id 6 to 140.134.21.166:3228 Waking up in 4 seconds... --- Walking the entire request list --- Cleaning up request 6 ID 6 with timestamp 4031ca75 Nothing to do.  Sleeping until we see a request.   Is anybody kindly can help me figure out where the problem is? thanks~   alex