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