Does the ISP > Marketo feedback loop still function?
We consistently send around 5-6 million emails per month, and have done so for years. However we only have 8 unsubscribed customers where the unsubscribe reason contains "Customer Complaint Received from ISP" (or even just the word "complaint") per the knowledgebase article below:
https://nation.marketo.com/t5/knowledgebase/feedback-loops-fbl/ta-p/248685
While I'm confident in our general content, segmentation and list hygiene practices, this still seems highly unlikely. Are any of you seeing unsubscribe activity with this unsubscribe reason or similar right now?
Thanks, Barry