Email address import definition Limitations

Hi There,

I'm looking to use the Email Address Import Definition feature to sync unsubscribes from another system without adding contacts to my database. Wondering if there's any limitation to the number of emails that can be added to the definition or any other limitations not called out in the documentation.

https://docs.oracle.com/en/cloud/saas/marketing/eloqua-rest-api/op-api-bulk-2.0-emailaddresses-imports-post.html

https://docs.oracle.com/en/cloud/saas/marketing/eloqua-rest-api/op-api-bulk-2.0-emailaddresses-imports-id-data-post.html

Thanks in advance!