How We Recovered a Blacklisted Domain in 11 Days

A DTC brand came to us in November with a problem: their primary sending domain was on Spamhaus DBL. Their inbox placement had dropped to 23%. Revenue from email went from $80K/month to $12K.

Here is the exact timeline and steps we used to fix it.

Day 1-2: Assessment

First, we identified why they got listed. The cause: they had imported a purchased list of 40K contacts six weeks earlier. That list contained spam traps. Spamhaus flagged them within a week, but they did not notice because they were only watching open rates (which, thanks to Apple MPP, still looked fine).

We immediately stopped all sending from the blacklisted domain. Every email, including transactional.

Day 3-4: Cleanup

We ran the entire list through three verification services. Removed 18K contacts (45% of the imported list was invalid or risky). Hard bounces, role addresses, known spam traps, disposable emails. All gone.

We also segmented the remaining list by engagement. Anyone who had not clicked an email in 90 days went to a suppression list. That removed another 22K contacts from the active list.

Day 5-7: Delisting request

We submitted a removal request to Spamhaus with documentation: what caused the issue, what we removed, what safeguards we put in place. We set up double opt-in for all new signups. We implemented real-time email verification on all forms.

Spamhaus responded on day 7 and removed the listing.

Day 8-11: Warm-up

Even after delisting, you do not go back to full volume. We built a warm-up schedule: Day 8: 500 sends to most engaged contacts only. Day 9: 2,000 sends. Day 10: 8,000 sends. Day 11: 25,000 sends.

Each day we checked inbox placement with seed tests. By day 11, we were at 97% inbox across Gmail, Outlook, and Yahoo.

Day 30: Results

With the cleaned list (60K contacts vs the original 120K), email revenue recovered to $74K. Lower list size, higher revenue per contact. The purchased list was not generating revenue, it was killing deliverability for the real subscribers.

Takeaways

Do not buy email lists. The short-term bump is not worth the deliverability damage. Monitor Spamhaus, SURBL, and Barracuda weekly. Do not wait until revenue drops to check. Keep a clean list as the default. Sunset disengaged contacts on a rolling 90-day window.