Incoming emails end up in Spam

[cwtbOK]

Hello!
I have noticed an on-going issue for about a month now.

Some incoming emails end up in our spam folders even if the senders are trusted, have marked other emails of those senders as not spam or have received other emails in the past from them without issues. This happens on all of our Roundcube accounts.

As we did not change any of our settings, I was wondering if anyone can assist. Let me know if you need further information.

Thank you in advance