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Exclaimer Simple Mail Transfer Protocol (SMTP) host list and Internet Protocol (IP) Whitelist

  1. Exclaimer Knowledge Base
  2. Solutions
  3. Mail Flow
Payal Arya
  • Updated

Description

The Exclaimer service uses a number of Simple Mail Transfer Protocol (SMTP) hosts to move your email across networks and complete the simple actions of sending and receiving mail between the sender and receiver. 

IMPORTANT! 
• Sender Policy Framework (SPF) has a hard limit of 10 Domain Name System (DNS) lookups. Exceeding this limit can cause SPF validation failures.  
• Use IP addresses instead of multiple include: entries to reduce DNS lookups. 
• Replace the include: entry with ip4: (IPv4 address) values. Do not use both for the same service. 
• Add only region-specific IP addresses required for your configuration.

For example:

Before
v=spf1 include:spf.exclaimer.net ~all
After
v=spf1 ip4:51.140.37.132 ip4:51.141.5.228 ~all

Exclaimer - Signatures for Microsoft 365:

Region Australia Canada Europe Germany  UAE United Kingdom United States
Region code AU CA EU DE UAE UK US
Host smtp.au1.exclaimer.net smtp.ca1.exclaimer.net smtp.eu1.exclaimer.net smtp.de1.exclaimer.net smtp.uae1.exclaimer.net smtp.uk1.exclaimer.net smtp.us1.exclaimer.net
IP Address 13.70.157.244
104.210.80.79
 		 52.233.37.155
52.242.32.10




52.169.0.179
104.40.229.156

 

 

 

IP1: 20.52.124.58 (Germany West Central)
IP2: 20.113.192.118 (Germany North)
20.233.10.24
20.216.75.206		 51.140.37.132
51.141.5.228		 104.209.35.28
191.237.4.149
*Reserve IP Address
4.147.77.224/28
13.70.111.133
13.77.40.21
20.11.153.211
20.70.98.72
20.70.99.137
20.70.191.69
20.92.94.98
20.213.152.246
48.215.128.0/28

4.205.211.97
20.116.87.192/28
20.104.93.21
20.104.155.16/28
20.104.126.221
20.104.198.253
20.175.91.44
20.220.67.154
40.86.218.228
40.86.217.250
 



4.208.58.224/28
4.231.228.164
20.103.205.0/28
20.223.219.178
20.224.197.165
20.229.49.212
20.229.240.140
51.124.180.120
52.236.57.250
94.245.107.39

 

 20.79.16.179
20.113.59.240
20.113.141.82
20.113.141.126
20.113.196.245
20.113.218.32/28
20.113.204.175
48.201.115.176/28
51.116.219.141
51.116.216.122
20.45.70.95
20.45.73.144/28
20.174.19.80/28
20.216.59.121
20.216.80.232
20.216.115.70
20.233.19.187
20.233.23.231
20.233.34.14
74.243.11.246		 20.26.63.64/28
20.108.19.175
20.254.204.128/28
51.104.197.158
51.132.13.82
51.132.244.84
51.141.105.74
51.140.240.223
51.140.250.96
51.137.178.51		 13.91.54.64/28
20.127.34.187
20.172.153.150
20.237.226.164
20.245.36.155
20.253.144.48
48.206.120.16/28
52.142.4.162
104.42.172.149
168.62.50.195
SPF Record spf.au.exclaimer.net spf.ca.exclaimer.net spf.eu.exclaimer.net spf.de.exclaimer.net spf.uae.exclaimer.net spf.uk.exclaimer.net spf.us.exclaimer.net
NOTE: * The Reserve IP Addresses have been added to Exclaimer’s mail flow infrastructure to improve flexibility and resiliency, with no impact on current mail flow and does not require any customer action.

Exclaimer - Signatures for Google Workspace:

CAUTION! If you are using Exclaimer - Signatures for Google Workspace, the relevant IP addresses must be used when setting up the SMTP relay, as detailed here: How to setup the Exclaimer Content Compliance rule.
Region Europe United States Germany 
Region code EU US DE
Host smtp.gseu.exclaimer.net smtp.gsus.exclaimer.net smtp.gsde.exclaimer.net
IP Address 20.50.220.144/28
40.127.253.48/28
13.64.55.16/28
52.226.94.192/28
 		 20.113.217.16/28
20.170.110.160/28 
SPF Record spf.eu.exclaimer.net spf.us.exclaimer.net spf.de.exclaimer.net