Free IP Blacklist Checker 

Check if your IP is blacklisted and protect your email deliverability with a free IP blacklist checker.

IP not listed in spam blacklists.

IP listed on certain blacklists

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BLOCKLIST

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What is an IP blacklist checker?

An IP blacklist checker is a tool that allows you to determine if your IP address has been listed in any email blacklist databases for suspicious activities or harmful activities, such as sending spam or unauthorized bulk emails. 

How does an IP blacklist checker work?

An IP blacklist checker carries out the following actions in real time:

  1. DNS record lookups: The tool queries DNS (Domain Name System) servers to find information associated with your IP address.

  2. Database comparison: It cross-references your IP against multiple known blacklist databases, such as Spamhaus and Barracuda to identify any matches.

  3. Blacklist status report: The tool generates a detailed report indicating whether your IP is listed on any blacklists, including the names of the databases.

Why should you use an IP blacklist lookup tool?

An IP blacklist lookup tool is vital for several reasons:

  1. Email deliverability: Ensuring emails sent from your IP address reach inboxes instead of landing in the spam folder or being blocked entirely by (Internet Service Providers) ISPs spam filters.

  2. Maintaining reputation: Safeguarding your IP’s reputation, ensuring that your audience continues to trust communications from your business.

How to fix issues detected by an IP blacklist check tool

If your IP is found on a blacklist, follow these steps to resolve the issue:

  1. Identify the blacklist: Use the tool’s report to pinpoint which database has blacklisted your IP.

  2. Investigate the cause: Determine why your IP was flagged – this could include sending spam, a compromised mail server, or suspicious email-sending practices.

  3. Resolve the issue: Secure your email server, update outdated software, remove malware, and review your email-sending practices. In addition, implement measures like throttling email volume or verifying recipient addresses to prevent future issues.

  4. Request delisting: Contact the blacklist administrators, provide evidence that the issue has been addressed, and send a removal request.

  5. Monitor regularly: Perform periodic IP blacklist checks to ensure your IP stays clean and avoid potential issues in the future.

Mailtrap Tip

Tip: If your IP was blacklisted due to spam caused by a security breach, resetting passwords and improving server security protocols is essential to regain trust and avoid repeat offenses.

Frequently Asked Questions

What is SPF?

SPF is an email authentication protocol that allows domain owners to specify which mail servers are authorized to send emails on behalf of their domain.

What is an SPF record?

An SPF record is a type of DNS record stored as a simple .TXT record. In the record file, domain owners specify the list of IP addresses (mail servers) that are authorized to send emails from a given domain.

Why is the SPF record important?

The SPF record is important because it helps protect your emails from being forged. Misconfigured or missing SPF records can lead to email delivery issues and negatively impact your domain’s reputation.

How to create an SPF record?

To create an SPF record, start by identifying all the servers and services authorized to send emails on behalf of your domain, such as mail servers or third-party services. Next, craft the SPF record in .TXT format, specifying the authorized servers. Once the record is ready, log in to your domain’s DNS provider and add it as a .TXT entry in your DNS settings. Finally, test the SPF record using a check tool to ensure it is configured correctly and that your emails are properly authenticated. Here is an example of what a SPF record should look like: v=spf1 include:example.com -all

Do you help with migration from another sending provider?

Mailtrap doesn’t show a preview in email clients, but you can use its email forwaring feature to send a message to your inbox and open it in any email client you are using.

Do you have a special offer for Agencies?

Mailtrap doesn’t show a preview in email clients, but you can use its email forwaring feature to send a message to your inbox and open it in any email client you are using.

How does SPF work with other email authentication protocols?

SPF integrates with other email authentication protocols like DKIM (DomainKeys Identified Mail) and DMARC to create a robust system for email security. SPF verifies whether the sending server’s IP address is authorized to send email messages on behalf of the domain, while DKIM ensures the email’s integrity and authenticity. DMARC ties these protocols together by enforcing alignment between SPF and DKIM results and providing domain owners with reports on email activity.

What are the common mistakes to avoid when creating an SPF record?

When creating an SPF record, there are several common mistakes to avoid. The key one is syntax errors; the record must follow the correct format, starting with “v=spf1” and including valid mechanisms such as include, a, or mx, as well as modifiers like redirect= and exp=. Other common mistakes include exceeding the DNS lookup limit, publishing multiple SPF records for the same domain, and not including all sending domains.

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