lib/Mailer/Mailjet.php
protected function format(MessageInterface $message)
    {
        $parameters = [
            'From'     => $this->buildSenderField($message->getFrom()),
            'To'       => $this->buildRecipientsField($message->getTo()),
            'Cc'       => $this->buildRecipientsField($message->getCc()),
            'Bcc'      => $this->buildRecipientsField($message->getBcc()),
            'Subject'  => $message->getSubject(),
            'Headers'  => $message->getHeaders(),
            'HTMLPart' => $message->getHtml(),
            'TextPart' => $message->getText(),
            'ReplyTo'  => $this->buildSenderField($message->getReplyTo()),
        ];

        $attachments = $this->processAttachments($message);
        if ($attachments) {
            if ($attachments['attached']) {
                $parameters['Attachments'] = $attachments['attached'];
            }

            if ($attachments['inlined']) {
                $parameters['InlinedAttachments'] = $attachments['inlined'];
            }
        }

        if ($message instanceof MetadataAwareInterface) {
            $parameters['EventPayload'] = $message->getMetadata();
        }

        if ($message instanceof TaggableInterface) {
            $parameters['MonitoringCategory'] = $message->getTag();
        }

        return json_encode(['Messages' => [array_filter($parameters)]]);
    }
protected function format(MessageInterface $message)
    {
        $parameters = [
            'From'     => $this->buildSenderField($message->getFrom()),
            'To'       => $this->buildRecipientsField($message->getTo()),
            'Cc'       => $this->buildRecipientsField($message->getCc()),
            'Bcc'      => $this->buildRecipientsField($message->getBcc()),
            'Subject'  => $message->getSubject(),
            'Headers'  => $message->getHeaders(),
            'HTMLPart' => $message->getHtml(),
            'TextPart' => $message->getText(),
            'ReplyTo'  => $this->buildSenderField($message->getReplyTo()),
        ];

        $attachments = $this->processAttachments($message);
        if ($attachments) {
            if ($attachments['attached']) {
                $parameters['Attachments'] = $attachments['attached'];
            }

            if ($attachments['inlined']) {
                $parameters['InlinedAttachments'] = $attachments['inlined'];
            }
        }

        if ($message instanceof MetadataAwareInterface) {
            $parameters['EventPayload'] = $message->getMetadata();
        }

        if ($message instanceof TaggableInterface) {
            $parameters['MonitoringCategory'] = $message->getTag();
        }

        return json_encode(['Messages' => [array_filter($parameters)]]);
    }
{@inheritdoc}