Sell provides a fixed range of outgoing IP addresses that you can allowlist, helping you to increase the security of your email integration. Every email that a user sends from Sell is sent from our official IP range of 18.104.22.168/25.
This is a range of 128 different IP addresses, starting from 22.214.171.124 through to 126.96.36.199.
All of these IP addresses should be allowlisted to ensure that your Sell email integration works properly.
You'll need to contact your email service provider or support team, and your security team if you have a firewall, to allowlist these IP addresses, as this can't be set in your Sell account.
See Configuring your firewall for use with Zendesk for more information on Zendesk firewall recommendations.