man auth_passwd (1): Change account's password

SYNOPSIS

#include <courierauth.h>

int rc=auth_passwd(const char *service, const char *username, const char *oldpassword, const char *newpassword);

DESCRIPTION

If username's password is oldpassword, it is replaced with newpassword. service identifies which so-called "service"'s password is changed; like "imap" or "pop3". Some Courier authentication library's back-end module can use different passwords for different services. service is ignored if this is not the case.