We are planning to sign with DKIM emails for multiple domains.
Each domain will have a CNAME to a DNS entry in a common domain where the keys are stored. If every domain sign with the same key, but off course using different domain and selector, all of them will created independent reputation?
If one domain is marked as spammer will affect the deliverability of the other domains?
They are completely different and uses a differnt selector. Just shared the key.