Metadata

Every email is sent with Craft context as Lettermint metadata. You can see it with each message in Lettermint.

Key	Value
craft_email	Key of the system message, e.g. forgot_password
craft_site	Handle of the site
craft_user	ID of the recipient user, e.g. with setTo($user)
craft_language	Language of the email, e.g. de-AT
craft_environment	Craft environment, e.g. production

Empty keys are skipped. For example, craft_email is missing for emails that aren’t system messages.

Add your own metadata

Metadata set on the message wins over the Craft metadata:

use Symfony\Component\Mailer\Header\MetadataHeader;

$message->getSymfonyEmail()->getHeaders()->add(new MetadataHeader('order_id', '1234'));