About Blacklists

Blacklists are intended to help identify and block sites that distribute harmful content. These lists are often compiled by internet service providers (ISPs) to help protect people, but sometimes sites get blacklisted when they shouldn't be. To help keep Mailchimp off blacklists and ensure our service is reliable, we enforce certain rules when you create and distribute campaign content.

In this article, you'll learn about blacklists and how they affect the work you do in Mailchimp.


First, let's define a few important terms.


The name of a website. For example, Mailchimp.com.

IP address

A unique string of numbers that identifies a particular server. For example, Mailchimp has several IP addresses that identify our servers to ISPs.


A list of blocked email addresses, domains, or IP addresses. For example, web browsers will prevent users from accessing websites that are blacklisted, and email providers may block mail that comes from blacklisted domains. Many blacklists are public, but some large ISPs maintain private blacklists.

How do you get blacklisted?

There are lots of ways you can end up on a blacklist, but it often has to do with email. If your emails get marked as spam, or ISPs see a sudden increase in email volume coming from your domain, you could get blacklisted.

Blacklists are intended to protect against harmful or malicious content, but they're not perfect. If you think you may be on a blacklist, don't worry, it's usually temporary. Usually, you'll be removed after some time has passed and there aren't any lasting effects.

Can Mailchimp Get Blacklisted?

Anyone can get blacklisted, but we have extensive policies in place to keep Mailchimp off blacklists. We prohibit certain content that could be considered harmful and actively monitor reputable blacklists like Spamhaus, Invaluement, Barracuda, Frontbridge, and SURBL. If a Mailchimp server does end up on a blacklist, we investigate immediately and get it removed as soon as possible.

You may also hear the term "greylist." These lists identify bulk email providers so private domains can block them if they don't want to receive email marketing at all. Because Mailchimp has a bulk email service, we're sometimes on greylists. Unlike blacklists, greylists typically don't have any negative consequences, and don't affect email delivery.

What does this mean for me?

Sometimes, you’ll get blacklisted despite your best efforts. Still, it’s important that you take precautions to avoiding being blacklisted, especially when you’re using Mailchimp. This is helps ensure your marketing campaigns reach your contacts, and it helps protect Mailchimp from being blacklisted, as well. Here are some general guidelines:

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