You forgot to load mail_crypt plugin.
mail_plugins = $mail_plugins mail_crypt
With these settings also. # dovecot -n ..... mail_location = mbox:~/mail:INBOX=/var/mail/%u mail_plugins = " mail_crypt" mbox_write_locks = fcntl ..... # service dovecot restart # doveadm mailbox cryptokey usage: doveadm [-Dv] [-f .........
# ls /usr/lib64/dovecot/modules/* | grep mail_crypt /usr/lib64/dovecot/modules/lib05_mail_crypt_acl_plugin.so /usr/lib64/dovecot/modules/lib10_mail_crypt_plugin.so /usr/lib64/dovecot/modules/libfs_mail_crypt.so /usr/lib64/dovecot/modules/doveadm/libdoveadm_mail_crypt_plugin.so
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