Mailprotector uses thirty-two servers to send outbound email, also called "otransports." Occasionally, an IP address can be blacklisted as a spam source or a user complaint will damage the IP addresses' reputation. The list below is the IP address for each of the thirty-two servers.
An IP address can be taken out of service by DevOps if a reputation problem is identified. Once the reputation problem has been resolved, DevOps will place the IP address back into service.
NOTE: In some cases, repair of an IP addresses' reputation requires continued email delivery even though the receiving system may rate-limit or delay the emails, such as Microsoft's free email domains (hotmail.com, outlook.com, live.com, and msn.com). In these cases, the IP is moved to a staging server to deliver 1% of outbound email or less.
Transport Server IP Addresses:
Transport Server Host Names:
Outbound transport servers have a hostname syntax as expressed below:
Reverse DNS records will be:
Transport Server IP List (for easy copy & paste)
188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199, 188.8.131.52, 184.108.40.206