Binding or whitelisting of an IP address along with your account's smtp credentials is a highly useful security feature as it enhances the security of your Netcore Email API account and ensures that the emails injected on your Netcore Email API account are injected ONLY from authorized IP's with valid smtp crednentials.
Please follow below steps in order to bind an IP address to your SMTP credentials:
1. Login to your CPaaS account using https://cpaas.netcorecloud.com
2. Go to Settings ==> Integrations ==> SMTP
3. You will find an option below your SMTP username and password to add specific IP's or range of IP's.
4. You can specify your authorized IP's within the same textbox in the showcased format and click Save.
Note: The same changes would be in effect in 1 hour from the time of configuration.