https://man7.org/linux/man-pages/man8/pam_setquota.8.html
pam_setquota(8) - Linux manual page
pamlinuxmanual
https://dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thread/UIM2IDAJLCY356MQUP2QBLJVA5Q2J2G4/
Dovecot 2.4 SETQUOTA, how to allow (admin) users to set quota (and write it back to LDAP) - dovecot...