Diagnosis report that the server is listed on SenderScore, "Excessive Number of Queries"

My YunoHost server

Hardware: VPS bought online / Old laptop or computer / Raspberry Pi (specify version, 0 to 4) at home / Internet Cube with VPN / Other ARM board / …
YunoHost version: x.x.x
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen | …
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no
If yes, please explain:

Description of my issue

Hello.

Today I had an email from root which is below:

The automatic diagnosis on your YunoHost server identified some issues on your server. You will find a description of the issues below. You can manage those issues in the 'Diagnosis' section in your webadmin.

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Email (mail)
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[ERROR] Your IP or domain 212.1xx.2xx.66 is blacklisted on SenderScore Blacklist
 - The blacklist reason is: "Excessive Number of Queries | https://knowledge.validity.com/hc/en-us/articles/20961730681243"
 - After identifying why you are listed and fixing it, feel free to ask for your IP or domain to be removed on https://senderscore.com

I’ve never seen this before in the 3 years of using ynh and using this ip address. I did go to the website but I still cant work out what the issue is. Everything is working well, no issues at all, well non that I can see.

Has anyone had this message, seen it and what should or could I do?

The sender is diagnosis@digitalcarnage.co.uk No such user on my system, to root@digitalcarnage.co.uk

Many thanks

Dj

Duplicate of Senderscore Blacklist / Blocklist because of Excessive number of queries