Step 1. Go to API keys

Go to API keys and click Create

Step 2. Create an API Key

Specify the key name and permissions. Permissions can be "Full" or at least "Mail".

Step 3. Copy the key

Step 4. Use the key with TrackMage

SMTP Server: smtp.sendgrid.net
Port: 587
Sender Email: your email
Security: STARTTLS
Username: your email
Password: the key from the previous step