score spam

hello, this spam (sharepoint phising) passed through the PMG filter. Do I understand correctly that mail was supposed to have a score of 2 (1.5 + 0.5), but he only got a score of 1? Please, what do you recommend to improve so next similar mail does not go through? ( we mark as spam from score...

we have a Synology Mail Plus Server running on a DS1621+. Mainly to get independent from mail providers and ensure confidentiality. Proxmox Mail Gateway runs as a virtual machine on the same. So far it worked well, but now we are running in severe problems. Emails from Banks, insurance...

It is possible to change the score for type verification, SPF, DKIM, DMARC. I know you have the Custom Scores option, but I don't know how I can configure it.