Example Code For Sending Transactional Emails With Mailjet

Mailjet is a powerful cloud-based email delivery service, here’s a quick example on how to send a transactional email with their API v3.1. To make sure your emails make it to the inbox, verify your sender domain and setup the SPF/DKIM authentication.

<?php

$mailjetApiKey = '';
$mailjetApiSecret = '';

$messageData = [
    'Messages' => [
        [
            'From' => [
                'Email' => '[email protected]',
                'Name' => 'from name'
            ],
            'To' => [
                [
                    'Email' => '[email protected]',
                    'Name' => 'to name'
                ]
            ],
            'Subject' => 'Mailjet test email',
            'TextPart' => 'Mailjet test body email message',
            'HTMLPart' => '<strong>Mailjet test body email message</strong>'
        ]
    ]
]; 

$jsonData = json_encode($messageData);
$ch = curl_init('https://api.mailjet.com/v3.1/send');

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
curl_setopt($ch, CURLOPT_USERPWD, "{$mailjetApiKey}:{$mailjetApiSecret}");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Content-Length: ' . strlen($jsonData)
]);

$response = json_decode(curl_exec($ch));

var_dump($response);

You can also use their official Mailjet PHP Wrapper.