DynDNS error spam in emails. "Domain 'sylvester.nohost.me' unknown"

My YunoHost server

Hardware: Raspberry Pi 4 at home
YunoHost version: 11.1.13
I have access to my server : Through SSH | through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

Every time a DynDNS update gets performed, it gives me an error saying that the ‘sylvester.nohost.me’ domain is unknown. However, I am not using this domain any more. It is not visible in the domains view, either.

Here is the error log: https://paste.yunohost.org/raw/jatanedija

Excuse the bump. My issue still persists and my inbox currently received 2700 emails since posting this issue

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