SMTP2GO uses special routing technology which means that wherever in the world you connect to us, you'll connect to the nearest server (geographically speaking) to your location.
For example, if you're in the USA, you'll connect with one of our servers based in the USA. If you're in Europe, you'll connect with one of our servers based in Europe, and if you're in Australia, you'll connect with our servers based in Australia. Customers wishing to only ever connect to Europe or Australia can choose a location-specific SMTP server name.
Connecting to a geographically close server is important as it greatly reduces the overall time to send an email, and can really speed things up if you're sending a large number of emails. We currently have inbound servers in Los Angeles (CA), Fremont (CA), Seattle (WA), Newark (NJ), Frankfurt (Germany), London (UK), Singapore, and Sydney (Australia). We also have data centers in Chicago (IL), Reston (VA), and Amsterdam (the Netherlands), and Sydney (Australia) which securely send emails and store your account information.
If your company wishes to have everything located in the EU, you can request to be placed in our Amsterdam data center. If you sign up from Europe, then your account will automatically be placed there. Similarly, you can request to be placed in our Australian data center (new accounts from Oceania are placed there automatically) or US data centers. To verify that your account is properly configured to process, send, and store data solely in your preferred data center, view our Verify Data Center and Server Location article or please contact our support team for further assistance.
Inbound IP Addresses
When you connect to our SMTP server (for most customers this is mail.smtp2go.com) you will connect to a different IP address depending on your location in the world. If you have an outbound firewall that only allows you to connect to particular IP addresses, you'll need to add the following entries to it.
Note: very few customers actually need to do this. If you do have such a firewall, follow this article to receive any updates if we ever add any additional IP addresses.
The range of IP addresses to allow:
139.162.187.151
139.162.6.108
173.255.233.87
176.58.103.10
45.33.53.153
45.63.29.157
45.63.29.168
45.79.71.155
66.228.43.14
45.79.170.99
45.79.114.202
194.195.251.121
172.105.254.10
45.79.238.223
45.56.87.145
143.42.182.164
172.233.58.206
103.2.140.82
103.2.143.7
43.228.184.6
103.47.204.4
172.104.10.120
172.235.57.244
172.235.57.16
172.234.246.155
172.234.246.156
203.31.36.20
203.31.36.21
203.31.36.22
203.31.36.23
203.31.36.24
203.31.36.25
103.2.140.13
103.2.140.246
117.120.12.143
172.233.45.81
Update December 2024:
US:
172.235.50.196
69.164.216.166
45.79.23.175
172.233.143.150
198.58.107.20
173.255.194.105
EU:
172.105.79.139
172.233.62.239
172.234.160.156
172.232.219.250
AU:
172.105.255.230
172.236.61.9
194.195.124.130
Outbound IP Addresses
When we deliver emails, they are delivered from a range of IP addresses. More information on our delivery IP addresses can be found here.