dovecot: earlier 99-ispconfig-custom-config.conf inclusion
The recent inclusion of 99-ispconfig-custom-config.conf (dovecot_custom.conf.master template) needs to happen earlier to allow global settings to be affected. Eg. I have "mail_plugins = $mail_plugins acl" on line 59, which produces error:
dovecot: config: Warning: /etc/dovecot/conf.d/99-ispconfig-custom-config.conf line 59: Global setting mail_plugins won't change the setting inside an earlier filter at /etc/dovecot/dovecot.conf line 70 (if this is intentional, avoid this warning by moving the global setting before /etc/dovecot/dovecot.conf line 70)