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Allowlist Campaign Monitor's addresses

If you're having trouble either receiving your own emails or accessing our software, you may want to ask your IT team to allowlist our addresses.

Campaign delivery addresses

Below are the addresses you can allowlist if you're having trouble receiving email from our software on your network. Depending on your situation, you can allowlist sending domains or IP addresses.

Return-path sending domains

Instead of allowlisting all of our sending IP addresses, you can allowlist our domains. They currently include cmail1.com through to cmail20.com, as well as createsend7.com

Authenticated domains

If you have set up authentication, you'll also want to allowlist the sending domain you have authenticated.

Sending IP addresses

Below are the IP ranges we use for sending email:

  • 27.126.146.0/24
  • 103.28.42.0/24
  • 146.88.28.0/24
  • 203.55.21.0/24
  • 204.75.142.0/24

If you need to allowlist IPs to receive email from our servers, we recommend mail administrators set up custom rules within their email filtering software. To work, the rule must match both of these conditions:

  • The email is coming from one of our IPs or sending domains (cmail1.com through cmail20.com, createsend7.com).
  • The email contains your domain in the "From" address.

Any email that doesn't match one of these conditions can be rejected. A custom rule like this is generally an acceptable solution for security teams and mail administrators.

SPF

While we handle SPF for you, some anti-spam services on your local network may be particularly strict, requiring our domain to be added to your own existing SPF record. In this case, you can add the following:

include:_spf.createsend.com

Upcoming IP addresses

We also own the following block of IP addresses, which may be used in the future to deliver emails. This page will be updated once they are in active use.

  • ipv6 2404:DE00::/32

Campaign Monitor makes use of Amazon Web Services for our application, API, and link tracking. For a complete set of IP ranges, please refer to Amazon's page (JSON file).

Webhooks, RSS reader, and link review tool

Below are the IPs used for webhooks, our RSS reader, and link review tool:

  • 103.28.41.253
  • 103.28.41.254
  • 146.88.16.128-135
  • 146.88.17.128-135