kacperinjo I, did receive your mail but in Spam :(
Strange thing is that the report seems ok:
31 december 2019 on 16:48
10/10 is nice score :)
I made also an test against SenderBase/Talos networks and you re ok https://talosintelligence.com/reputation_center/lookup?search=server.otohost.pl
I have send you a PM with mu gmail adress please try to send me test mail
If you don't have root access then your php versions depends on the one your administrator/root has install this on the server.
I'm not sure that you can install php versions as reseller and for Custombuild you must be admin to use