icloud mail, some forwarded messages not delivered

Dear all,

I do forward my two professional mailboxes to icloud.com so I have all my emails centralized in a single location.

Since a few days, some of the messages forwarded are not delivered to my icloud inbox; I assume they are blocked by the spam assassin.

What is possible to do to avoid messages to be blocked ?

Is there a way to view messages blocked on server side ? (messages do not arrive in Mail app as spam, it is not delivered at all!)

Is it possible to change the spam assassin working level ?

Thanks in advance,

Lionel