What are the validations/verifications that checks are subjected to before they are approved?

The check standards are as follows :

• Endorsement: "For mobile deposit at [bank name]" and signed by account owner (if the signature is very clearly not the account owner, the check will not be accepted. Keep in mind we do not match signatures)
• Date: <180days
• Picture: Is it clear? There are cases where the picture is not clear, but will still come to us. In that case, we will have to reject.
• Made out to one party (not signed over)