Task: Send an email using Mailjet

n8n workflow JSON:
{"nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"Mailjet","type":"n8n-nodes-base.mailjet","position":[450,300],"parameters":{"text":"This is a test message","subject":"Sample Subject","toEmail":"user2@example.com","fromEmail":"user@example.com","additionalFields":{}},"credentials":{"mailjetEmailApi":"mailjet creds"},"typeVersion":1}],"connections":{"On clicking 'execute'":{"main":[[{"node":"Mailjet","type":"main","index":0}]]}}}