Outbound Transport Server IP List

Description

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:

otransport-1 52.1.23.3
otransport-2 52.1.140.110
otransport-3 52.1.182.179
otransport-4 54.84.14.167
otransport-5 54.84.246.51
otransport-6 54.152.160.215
otransport-7 52.22.79.245
otransport-8 52.20.59.36
otransport-9 52.0.21.132
otransport-10 52.22.72.116
otransport-11 52.3.94.45
otransport-12 52.1.62.31
otransport-13 54.208.239.9
otransport-14 54.172.220.45
otransport-15 18.204.234.187
otransport-16 18.232.37.98
otransport-17 52.1.21.150
otransport-18 52.5.166.138
otransport-19 54.164.123.4
otransport-20 54.164.131.225
otransport-21 54.173.10.57
otransport-22 34.194.188.63
otransport-23 18.214.85.87
otransport-24 107.23.53.12
otransport-25 35.153.239.198
otransport-26 3.209.199.18
otransport-27 35.169.41.199
otransport-28 57.7.80.136
otransport-29 34.237.235.151
otransport-30 3.209.239.254
otransport-31 54.236.173.181
otransport-32 35.168.124.141


Transport Server Host Names:

Outbound transport servers have a hostname syntax as expressed below:

otransport-X.outbound.emailservice.io

Reverse DNS records will be:

otransport-X.outbound.emailsrv.net

Transport Server IP List (for easy copy & paste)

52.1.23.3, 52.1.140.110, 52.1.182.179, 54.84.14.167, 54.84.246.51, 54.152.160.215, 52.22.79.245, 52.20.59.36, 52.0.21.132, 52.22.72.116, 52.3.94.45, 52.1.62.31, 54.208.239.9, 54.172.220.45, 18.204.234.187, 18.232.37.98, 52.1.21.150, 52.5.166.138, 54.164.123.4, 54.164.131.225, 54.173.10.57, 34.194.188.63, 18.214.85.87, 107.23.53.12, 35.153.239.198, 3.209.199.18, 35.169.41.199, 57.7.80.136, 34.237.235.151, 3.209.239.254, 54.236.173.181, 35.168.124.141

Have more questions? Submit a request

Comments