Whitelisting Our IP Addresses With Your Incoming (MX) Server
SMTP2GO sends out emails from a range of different IP addresses.
The current IP addresses we use can always be found by looking at the SPF record for spf.smtp2go.com:
On the above page, you will see a series of IP address ranges, in the following format:
ip4:xyz.xyz.xyz.xyz/nn (this is called CIDR format)
If it is possible, it is often a good idea to have your incoming (MX) mail server whitelist the IP ranges shown on the above page.
The benefits of whitelisting with your incoming mail server include:
- automatically bypassing unnecessary spam filters (as you have sent the emails, they shouldn't need to be scanned).
- automatically bypassing any blacklist checks (just in case any IP address ever features on a blacklist).
Below is a sample screenshot from cPanel showing where to add an IP address to the whitelist:
If you wish to be notified whenever we add new IP addresses, please subscribe to this page.
Latest update (July 2018): The outbound IP range 188.8.131.52/22 has been added.