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I wondered for a while if I should do this before v1.0, but since there seem to be problems with some PAM/NSS users and this was way easier to implement than I realized, here it is: passdb pam and userdb passwd now support blocking=yes setting in their args. For PAM the default has been to fork the dovecot-auth process and talk via a pipe to the main dovecot-auth. I've never really liked this