This is an extremely useful security feature to help you inject emails ONLY from whitelisted IP address while using authorized API key.
Please follow below given steps to add an IP or range of IPs to your API key :
1. Login to your CPAAS account using link : https://cpaas.netcorecloud.com
2. Go to settings ==> integrations ==> API
3.You can either click on create a new API key (if not created earlier) or edit an existing API key
A. While creating new API key
a1. Click on create a new API key
a2. Give a name to your API key
a3. Define custom permissions for your API key (if required)
a4. Add specific IPs or range of IPs which you want to bind with that API key
a5. Save the configuration
B. While editing existing API key
b1. Click edit on your existing API key
b2. Add specific IPs or range of IPs which you want to bind with that API key
b3. Save the configuration
This change would be in effect within next 1 hour after configuration is save.