400
<br><br>Array
(
    [0] => HTTP/2 400
    [1] => date: Mon, 29 Dec 2025 12:44:10 GMT
    [2] => content-type: application/json
    [3] => content-length: 206
    [4] => server: nginx
    [5] => access-control-allow-origin: https://sendgrid.api-docs.io
    [6] => access-control-allow-methods: POST
    [7] => access-control-allow-headers: Authorization, Content-Type, On-behalf-of, x-sg-elas-acl
    [8] => access-control-max-age: 600
    [9] => x-no-cors-reason: https://sendgrid.com/docs/Classroom/Basics/API/cors.html
    [10] => strict-transport-security: max-age=31536000; includeSubDomains
    [11] => content-security-policy: frame-ancestors 'none'
    [12] => cache-control: no-cache
    [13] => x-content-type-options: no-sniff
    [14] => referrer-policy: strict-origin-when-cross-origin
    [15] => 
    [16] => 
)
<br><br>{"errors":[{"message":"The to email parameter is required.","field":"personalizations.0.to.0.email","help":"http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.personalizations.to"}]}
<br><br><br><br>2025-12-29 13:44:10