Can Qpopper look for passwords in a file other than /etc/passwd?
While Qpopper uses system authentication calls, if you use PAM, you can have Qpopper use a PAM module which gets authentication information from a source other than /etc/passwd or /etc/shadow (for example, LDAP). Note that since Qpopper reads the mail spool of the Unix user, it still needs a pwnam entry for the user. In addition, there are third-party patches which provide alternative mechanisms. Qualcomm does not provide support for Qpopper patches such as these.