How to distinguish between spam-foldering and rate limiting?

Rate limiting and spam-foldering are different problems:

Rate limiting indicators: Deferred messages in your logs. 4xx responses. Slow delivery times. Messages eventually deliver but take longer.

Spam-foldering indicators: Normal delivery speed. No deferrals. But messages land in spam folder. Low opens despite delivered status.

Diagnosis: Check your bounce and deferral logs. Rate limiting shows temporary failures. Spam-foldering shows clean delivery.

Both hurt results but require different remediation. Rate limiting needs volume reduction. Spam-foldering needs reputation repair.

Throttling slows your entry to port. Spam-foldering routes you to the impound lot after entry.