Which mailbox providers report spam complaints back to ESPs?
Summary
What email marketers say10Marketer opinions
Email marketer from Mailjet shares that FBLs are offered by major mailbox providers, including Gmail, Yahoo, and Microsoft. They require senders to authenticate their email and adhere to specific guidelines to participate.
Email marketer from Litmus explains that monitoring complaint rates, typically available through FBLs, is essential for maintaining good email deliverability. High complaint rates negatively impact sender reputation.
Email marketer from SparkPost shares that monitoring complaint feedback from mailbox providers is crucial for maintaining good sender reputation. They also indicate that Gmail, Yahoo, AOL, and Microsoft are key providers offering FBLs.
Email marketer from Reddit states Gmail, Yahoo, AOL, and Microsoft (Outlook.com/Hotmail) are the main providers offering feedback loops.
Marketer from Email Geeks mentions their reporting is 100%.
Marketer from Email Geeks shares that Apple does not report abuse/complaints, nor do most business mail systems. They also mention that none of the systems report back 100% of complaints.
Email marketer from Email Marketing Forum emphasizes the importance of setting up FBLs with all major providers you send to, including Gmail, Yahoo, and Microsoft, to track and address spam complaints effectively.
Marketer from Email Geeks states Hotmail (Microsoft free mail) does report, while Exchange likely does not. Yahoo/AOL also report, but not 100%.
Email marketer from GMass explains that a feedback loop lets you know when someone marks your email as spam in Gmail, AOL, Yahoo, Outlook, and other email clients.
Email marketer from EmailVendorSelection.com explains that feedback loops (FBLs) are agreements between mailbox providers and email senders. They allow senders to receive reports about spam complaints from users of that specific provider.
What the experts say2Expert opinions
Expert from Word to the Wise describes complaint rates from users as a critical factor mailbox providers use to filter mail. High complaint rates from providers such as Gmail and Microsoft result in emails being sent to junk or blocked.
Expert from Spamresource.com explains that Feedback Loops (FBLs) are a method for email senders to receive spam complaints from ISPs. The major participants are detailed in the linked article.
What the documentation says3Technical articles
Documentation from Yahoo explains that senders can use their Complaint Feedback Loop program to receive reports of user complaints marked as spam in Yahoo Mail.
Documentation from Google Postmaster Tools details the Gmail Feedback Loop (FBL), which allows senders to identify campaigns causing spam complaints. It requires setting up specific headers in your emails.
Documentation from Microsoft SNDS (Smart Network Data Services) describes a service that provides data about your sending IP addresses, including complaint rates from Hotmail and Outlook.com users.