How to clean up a sender domain's reputation if emails are massively landing in spam?

The reputation of a domain and the IP address of a mail server are key metrics relied upon by email providers like Gmail, Yandex, or Mail.ru when deciding whether to deliver an incoming email. If your legitimate newsletters or system notifications have started massively landing in the spam folder, it means that trust in your domain has been undermined due to user complaints, a high percentage of non-existent addresses, or technical errors in the settings.

The reputation recovery process requires a systematic approach and strict technical discipline. As a first step, you need to conduct a complete audit of the infrastructure and ensure that basic records are correct. You must have an SPF record configured to specify legitimate servers, a DKIM signature to verify email integrity, and a DMARC policy that tells mail services how to handle emails that fail verification.

The second important stage is cleaning the subscriber database and maintaining mailing hygiene. Remove all inactive addresses from the database that previously experienced bounces or hard delivery errors. Be sure to include a prominent and working unsubscribe link in every email so users can opt out of receiving the newsletter instead of clicking the report spam button. A sharp reduction in the number of complaints is the primary signal for provider algorithms.

To accelerate the rehabilitation process, you can use feedback loops and postmasters of the largest email services. Register your domain in Yandex, Mail.ru, and Google Postmaster Tools. These free services show the current reputation level, spam percentage, and technical delivery issues, while also allowing you to track the dynamics of restoring trust in your email campaign.