Mailjet

Mailjet

Sinch's email platform with API key + secret pair authentication. 6,000 emails/month free with 200/day limit.

Easy~5 minAPI

Step-by-step

Sign up + verify your sender

Sign up at mailjet.com. Verify your email; in the dashboard go to Account Settings → Sender domains & addresses → Add a sender to verify a single email or a full domain.

Get your API Key + Secret Key

Mailjet → Account Settings → API Key Management (REST API). You'll see two values: API Key and Secret Key.

Copy both. The API Key is your username; the Secret Key is your password.

Add the connection in SendGrail

SendGrail → Connections → Add Connection → pick Mailjet.

Fill in:

• Connection Name: Mailjet
• From Email: your verified sender
• From Name: display name
• Username: API Key from step 2
• Password: Secret Key from step 2

Click Save.

Test

SendGrail → Test Email → pick Mailjet → send.

Troubleshooting

• Invalid_credentials — wrong API Key / Secret Key combination. Double-check both values from Mailjet's dashboard.
• Sender Address Rejected — From Email not verified in Mailjet. Add it under Sender domains & addresses.
• 429 Too Many Requests — hit Mailjet's rate limit. Free plan: 200 emails/day, 6,000/month. Upgrade or throttle.

What's next

• Email Routing — route specific emails through Mailjet.
• Failure Alerts — get pinged on rejections.