How to Get Off an Email Blacklist (Spamhaus, Barracuda and More)

An email blacklist, or DNSBL, is a list of IP addresses and domains known for sending spam. Mailbox providers check these lists before accepting mail, so a listing can quietly send your campaigns to spam or get them rejected entirely.

Step 1: Confirm the listing

Start by checking which lists you are on. Spamhaus, Barracuda, SpamCop and SORBS are the ones that most affect deliverability. Note the exact list, because each has its own delisting process.

Step 2: Find and fix the cause

Delisting will not stick unless you fix what caused it. The most common causes are:

• A compromised account or device sending spam from your network.
• Sending to invalid addresses and spam traps, which a dirty list is full of.
• An open relay or misconfigured mail server.
• Sudden volume spikes that look like a botnet.

Cleaning your list is the highest-impact fix, because spam traps and high bounce rates are a leading reason senders get listed. Verify your list and remove invalid and risky addresses before you send again.

Step 3: Request delisting

Once the cause is resolved, use the blacklist operator's removal form. Be honest about what happened and what you fixed. Most reputable lists delist quickly when the underlying issue is gone, though repeat offenders face longer waits.

Step 4: Prevent the next listing

Keep bounce rates low, authenticate with SPF and DMARC, warm up new IPs gradually, and verify every list before sending. For the bigger picture, see our guide to why emails go to spam.