IP Addresses for Mail Delivery, Directory Sync, and POP3/LDAP Authentication

IP Addresses for Mail Delivery

Transport Servers

United States

52.0.70.91
52.0.74.211
52.0.31.31

Europe

54.229.38.56
54.229.197.37
54.229.198.191

Asia Pacific

54.66.143.79
54.66.158.252
54.66.239.122

Inbound Gateway Servers

52.0.43.153
52.0.90.6
52.0.156.43
52.0.161.190
52.1.76.196
52.1.130.188
52.1.217.73
54.85.114.151
54.152.152.44
54.80.77.105
52.204.186.160
3.213.159.102
23.214.219.227
18.214.219.227
34.233.23.45

IP Addresses for LDAP/Active Directory User Sync

54.152.160.142
54.152.160.187

IP Addresses for POP3/LDAP Authentication (Deprecated)

NOTE: POP3 authentication connects via ports 110 & 995 - You will need to ensure your firewall is open on 110 & 995 from the above Mailprotector ranges.

54.152.160.142
54.152.160.187
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