// Allow other modules to alter the Mandrill message.
$sendgrid_params = [
'message' => $sendgrid_message,
];
\Drupal::moduleHandler()
->alter('sendgrid_integration', $sendgrid_params, $message);
// Lets try and send the message and catch the error.
try {
$response = $client->send($sendgrid_message);
}
catch (SendgridException $e) {
The $sendgrid_message Mail object can be complemented but can never be replaced completely. We need replacement replacement capability because the object won't let us change/replace already set properties.
Changing $response = $client->send($sendgrid_message); to $response = $client->send($sendgrid_params['message']); solves this issue.
Needs review
2.2
Code