Warning: mail_extra_groups setting was often used insecurely

[yehlu]

dovecot 出現以上訊息
Warning: mail_extra_groups setting was often used insecurely so it is now deprecated, use mail_access_groups or mail_privileged_group instead

將設定檔
/etc/dovecot/dovecot.conf
的
mail_extra_groups = mail
改為
mail_access_groups = mail