The spam rule score setting is for advanced users. If you have any problems with valid emails being marked as spam, adjust or turn off "Spam Score Required". View The normal value is 5. If the value is too high then it may mark good emails as spam. Too low and more spam emails will get through.

When you turn on "Spam Score Required", extra spam checks are done for new emails.

Note:
This filter may falsely mark some valid senders as spam. Some networks and email providers may not allow this checking and cause emails to be marked as spam.
Always check your spam folder to see if any emails have been added in error. You can then swipe to mark those emails as 'Not Spam' so they are not marked as Spam again.