Hello,

I am using Postfix version 2.5.2 with dovecot

I am having below problem for plain text authentication:

Jun 27 16:11:58 smtp(pam_unix)[3745]: check pass; user unknown
Jun 27 16:11:58 smtp(pam_unix)[3745]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
Jun 27 16:12:00 saslauthd[3745]: do_auth : auth failure: [user=abc] [service=smtp] [realm=xxxx.com] [mech=pam] [reason=PAM auth error]

My /etc/pam.d/smtp file is as under:

#%PAM-1.0
auth required pam_stack.so service=system-auth
account required pam_stack.so service=system-auth

Just done know what is the problem. My POP server is getting properly authenticated.

Thanks for help!
onik