If the sender's email address isn't associated with that specific claim, it goes into the moderation queue. This prevents just 'anyone' from getting a claim email and pushing information into it. You can whitelist email addresses so that they clear into a claim automatically and/or add that user to the claim as a 3rd party vendor with the appropriate email address.
How to whitelist emails

We suggest taking the Configuration Guide for Administrators to learn how to configure your email archive settings.