In 2026, a SURBL listing has no measurable impact on inbox placement — major mailbox providers no longer weight it, and our sending IPs are not blacklisted.
If you see your domains on SURBL (for example in MXToolbox or an Instantly warning): don't panic, don't pause campaigns, and don't reduce volume. Keep warming up and sending as usual.
Full explanation: SURBL Listings and Deliverability Impact. For other deliverability questions (inbox placement, results), contact support.