pam_stack is deprecated as it won't be accepted upstream and there is a replacement for its functionality. Also there is a new common pam configuration file for all config utilities (system-config-*). Please use the attached pam configuration files for system-switch-mail.
Created attachment 119921 [details] system-switch-mail.pam (it can be used for system-switch-mail-nox.pam as well)
it's fixed in 0.5.25-5. thanks