MailChannels & SpamExperts
Outbound email from our servers is sent via MailChannels or SpamExperts, ensuring your mailing reputation is nearly perfect.
MailChannels sends messages from a large number of IP addresses. This list of addresses can and does occasionally change. Fortunately, the list is always available in their SPF records. You can look up the list easily using various online tools. We recommend using the SPF record lookup available at MXToolbox & Dmarcian.
In order to accept messages from the SpamExperts public cloud (antispamcloud.com) filtering servers, emails coming from “delivery.antispamcloud.com” host should be explicitly allowed on your mail server. This hostname contains all active IP addresses used to send email from SpamExperts public cloud. Alternatively it is possible to allow traffic from any IP address with the PTR record *.antispamcloud.com.
SpamExperts also provides a blog with their most recent list of IPs.
