If you're having trouble either receiving your own emails or accessing our software, you should first make sure your domain name is verified. If that does not fix the issue, then you may want to ask your IT team to add our sending email addresses to your email program's "allow list".
Campaign delivery addresses
If are are not receiving emails from our software on your network, then you can add the below addresses to your allow list. You can add the sending domains or IP addresses (depending on what your email program allows).
Return-path sending domains
Instead of using our sending IP addresses, you can instead add our domains to your allow list. They include cmail1.com through to cmail20.com.
Authenticated domains
If you have set up DKIM authentication, you'll also want to add your authenticated domain to your allow list.
Sending IP addresses
Below are the ranges of IP addresses 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 add IPs to your allow list to receive email from our servers, we recommend setting up custom rules within their email filtering software. To work, the rule must match both of these conditions:
- The email is from one of our IPs or sending domains (
cmail1.comthroughcmail20.com). - The email contains your domain name in the "From" address.
Any email that does not match one of the above conditions can be rejected. A custom rule like this is often an acceptable solution for security teams and mail administrators.
Provisioning a Static IP Address
At this time, we do not offer the ability to set up a Static IP address for sending emails. While using a Static IP address might be beneficial for some uses, it does not solve deliverability problems or protect your email address from being added to "blocklistings". An email address that is tied to a verified domain name has a much stronger reputation with email platforms than an IP address reputation.
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