If your application is using the Mailgun driver, you may consult Mailgun's documentation for more information on [tags](https://documentation.mailgun.com/en/latest/user_manual.html#tagging-1) and [metadata](https://documentation.mailgun.com/en/latest/user_manual.html#attaching-data-to-messages). Likewise, the Postmark documentation may also be consulted for more information on their support for [tags](https://postmarkapp.com/blog/tags-support-for-smtp) and [metadata](https://postmarkapp.com/support/article/1125-custom-metadata-faq).
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