The tool accepts both formats. If you are checking a sending domain for email deliverability, enter the domain. If you are checking the mail server itself, enter the IP of your outbound mail server, not the domain. These are different things, and checking the wrong one is the most common mistake people make here.<\/p>\n
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Step 2: Read the Results Table<\/h3>\n
Results are returned as a table with each DNSBL listed in one column and a pass\/fail status in the next. Green rows mean clean. Red or flagged rows mean the IP or domain appears on that specific list.<\/p>\n
Each blacklist operates independently. Being listed on Spamhaus SBL carries significantly more weight than being listed on a low-traffic DNSBL with minimal adoption. Alaikas typically shows 30 or more lists in a single check, so scanning the full table matters, not just the summary count.<\/p>\n
Step 3: Note the Listed DNSBLs by Name<\/h3>\n
When you find a listing, record the exact DNSBL name. You will need this to:<\/p>\n
- \n
- Understand why you were listed (each list has its own listing criteria)<\/li>\n
- Look up removal procedures (removal steps differ by list operator)<\/li>\n
- Confirm removal after the delisting request is processed<\/li>\n<\/ul>\n
Do not assume all blacklists follow the same process. Spamhaus, SORBS, Barracuda, and SpamCop each have separate lookup and removal portals.<\/p>\n
What the Blacklist Lookup by Alaikas Actually Checks<\/h2>\n
The Alaikas tool queries DNS-based blacklists, which are distributed databases that ISPs, mail servers, and security tools query in real time when deciding whether to accept a connection or deliver an email.<\/p>\n
The Main DNSBL Categories<\/h3>\n
Spam-sending blacklists<\/strong> flag IPs and domains caught actively sending unsolicited bulk email. Spamhaus Zen (a composite zone including SBL, XBL, and PBL) is the most widely queried list in this category. Getting listed here affects email delivery at major providers including Gmail, Outlook, Yahoo, and most enterprise mail gateways.<\/p>\n
Policy-based lists<\/strong> flag IPs that should not be sending email directly, such as residential IP ranges assigned to consumer broadband. The Spamhaus PBL is the most common example. Being on PBL does not mean you were caught spamming. It means your IP is in a range designated for end-user access, not outbound mail servers. If you are running a legitimate mail server on a business IP, you can request removal from PBL directly through the Spamhaus website.<\/p>\n
Exploit-based lists<\/strong> flag IPs associated with malware infections, botnet activity, or open proxies. The Spamhaus XBL pulls data from CBL (Composite Blocking List), which tracks IPs exhibiting automated spam-sending behavior consistent with infected machines.<\/p>\n
Domain-specific lists<\/strong> like URIBL and SURBL flag domains appearing in spam email bodies, not necessarily the sending IP. If your domain is in the body of spam sent by someone else, you can still get listed here even if your own infrastructure never sent a single spam message.<\/p>\n
Understanding which category flagged you tells you whether the issue is a misconfigured server, compromised infrastructure, an abuse complaint, or collateral listing from a third party.<\/p>\n
Why Your IP or Domain Appears in a Blacklist Lookup by Alaikas<\/h2>\n
Most IPs and domains end up listed for one of five reasons. Knowing which one applies to you determines how fast you can resolve it.<\/p>\n
You Sent Mail to Spam Traps<\/h3>\n
Spam traps are email addresses maintained by blacklist operators to catch senders who are using purchased lists, scraping addresses, or failing to purge inactive subscribers. There are two types:<\/p>\n
- \n
- Pristine spam traps:<\/strong> Addresses that have never been used to sign up for anything. Any email sent to them is, by definition, unsolicited.<\/li>\n
- Recycled spam traps:<\/strong> Old abandoned addresses that were valid once but have since been converted by ISPs and blacklist operators. Sending to them signals poor list hygiene.<\/li>\n<\/ul>\n
If your ESP (Klaviyo, Mailchimp, ActiveCampaign, Sendgrid) has flagged engagement issues or sudden deliverability drops, and your Alaikas check shows Spamhaus or SORBS listing, a spam trap hit is the most likely cause.<\/p>\n
Your IP Was Compromised or Part of a Botnet<\/h3>\n
Automated spam-sending behavior from your IP, even without your knowledge, triggers DNSBL listing within hours on CBL and XBL. A compromised server, a WordPress installation with a malicious plugin, or an open mail relay can result in thousands of outbound spam messages before you notice.<\/p>\n
If your listing appears on CBL\/XBL specifically, run a full malware scan on the server associated with that IP immediately. Requesting delisting without fixing the underlying issue results in re-listing within 24 to 48 hours.<\/p>\n
High Complaint Rates from Recipients<\/h3>\n
When enough recipients click “Mark as Spam” on your emails, ISPs feed that signal to blacklist operators. Gmail and Outlook both operate feedback loops that aggregate complaint data. An aggregate complaint rate above 0.3% over a rolling 7-day period is enough to trigger action at Spamhaus or get your IP added to internal blocklists at major ISPs.<\/p>\n
Your Domain Appeared in Spam Sent by Others<\/h3>\n
If your brand domain is being spoofed or your tracking links appear in spam campaigns, URIBL and SURBL can list your domain regardless of your sending behavior. This is a reputation hijacking scenario and it requires a different resolution path: submitting evidence of spoofing directly to the relevant DNSBL operator rather than simply requesting removal.<\/p>\n
Shared IP Contamination<\/h3>\n
If you are on a shared hosting plan or a shared IP pool from an ESP, another sender on that IP can get the IP listed, and your deliverability suffers as a result. This is why dedicated IPs matter for high-volume email programs and why checking your current sending IP against the blacklist lookup by Alaikas before launching a new campaign is worth the 90 seconds it takes.<\/p>\n
How to Check Multiple IPs and Domains Using Blacklist Lookup by Alaikas<\/h2>\n
Running one IP at a time through any blacklist checker is workable for a single server. It breaks down fast when you are managing multiple clients, checking a range of outbound IPs after a migration, or auditing an entire domain portfolio.<\/p>\n
Export Your IP or Domain List First<\/h3>\n
- Recycled spam traps:<\/strong> Old abandoned addresses that were valid once but have since been converted by ISPs and blacklist operators. Sending to them signals poor list hygiene.<\/li>\n<\/ul>\n
- Pristine spam traps:<\/strong> Addresses that have never been used to sign up for anything. Any email sent to them is, by definition, unsolicited.<\/li>\n
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