UW-Madison Office 365 and Campus Relay IP Addresses

Some services and IT Partner mail systems use IP restrictions to limit what sources they will accept mail from. This document is intended to support those services by defining what IPs will be used to send UW-Madison Office 365 and Campus Relay mail.

UW-Madison Office 365

Mail sent from UW-Madison Office 365 accounts will either be routed through our email security provider, Proofpoint, or will be sent directly from Microsoft. 

Proofpoint:

205.220.165.71

205.220.177.71

Microsoft:

IPv4

40.92.0.0/15

40.107.0.0/16

52.100.0.0/14

104.47.0.0/17

51.4.72.0/24

51.5.72.0/24

51.5.80.0/27

20.47.149.138/32

51.4.80.0/27

IPv6

2a01:111:f400::/48

2a01:111:f403::/49

2a01:111:f403:8000::/50

2a01:111:f403:c000::/51

2a01:111:f403:f000::/52

2a01:4180:4051:0800::/64

2a01:4180:4050:0800::/64

2a01:4180:4051:0400::/64

2a01:4180:4050:0400::/64

Campus Relay Mail

Campus relay mail is transitioning to the Proofpoint Secure Email Relay service. During the transition, relayed mail may be sent through either the legacy WiscMail infrastructure or Proofpoint. 

Proofpoint

67.231.145.152

67.231.153.115

Wiscmail

144.92.197.128/25

ITE Mail

For those systems and services that integrate with our ITE email infrastructure you should be aware that our test Office 365 and relay environments use a different set of IP addresses

UW-Madison Office 365 Test

Proofpoint:

208.84.65.169

67.231.156.131

Microsoft:

Same as Production. See above. 

Relay Test

Proofpoint:

148.163.151.186

148.163.155.128

WiscMail:

144.92.170.0/25


Keywords:
smtp relay email smtp.wiscmail.wisc.edu relay.mail.wisc.edu IP Office 365 
Doc ID:
129447
Owned by:
O365 S. in Microsoft 365
Created:
2023-07-03
Updated:
2023-07-03
Sites:
DoIT Staff, Microsoft 365, Public Cloud