A domain can be perfectly authenticated and still be blacklisted. Blacklisting usually happens after a spike in spam complaints, a sudden volume increase without warmup, or shared IP space with another sender who got flagged. Once listed, inbox placement drops immediately, often before you notice anything is wrong.
Where We Check
- Spamhaus, the blocklist most major providers weight heaviest
- Barracuda Reputation Block List
- SORBI and other major aggregated blocklists
- Provider-specific reputation signals inside Gmail Postmaster Tools and Microsoft SNDS where available
Reading Sender Score, Not Just Blacklist Status
A domain can be technically off every blacklist and still carry a low sender score that quietly suppresses inbox placement. We review sender score trends over time, not just a single snapshot, to catch a reputation that is declining before it crosses into an actual listing.
Removal Process
If a domain is listed, we submit removal requests directly to the blocklist provider with the required documentation, and in parallel identify and stop whatever sending behavior caused the listing in the first place. Removal alone without fixing the root cause just means the domain gets listed again within weeks.
Ongoing Monitoring
Every domain under an active Advazon campaign is monitored against these same blacklists weekly, so a new listing is caught within days rather than discovered a month later when reply rates have already dropped.