Step 2: Copy an existing API Key or create a new one
Once logged in, head to the Settings section of the SendGrid portal. Then, head to the API Keys section. If you don't already have an existing API Key in your account, you'll need to create one first.
Step 3: Make sure you create a Sender Identity
When delivering mail using an API Key, you'll always need at least one verified sender. To create a verified sender identity, head to the Sender Authentication sectionof the portal. From there, you'll be able to manually verify a Sender using a single address or authenticate an entire domain.