Have a third party SFDC developer who built the Marketing Cloud (MC) connector and wrote the post strings to create records in MC.
Recently, I discovered that several emails of our customers were blocked by ListDetective because email contained "Info@".
I emailed Support about getting some logs for visibility. However, this is something they cannot help with and they suggested adding some client-side error logging in the API post strings to get this information. What are some methods I should consider and look into?