I had the same issue with PAM errors on ubuntu 14 LTS with Dovecott refusing to authenticate users and deny email.
I removed libpam-smbpass and a few mins later all my email clients started to work. maybe because of updates to systemd? there was also PAM updates recently. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1571883 Title: libpam-smbpass:amd64 (2:4.3.8+dfsg-0ubuntu0.14.04.2) causes PAM failure for dovecot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1571883/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs