product · inferred from evidence
X-PM-Message-Id
A custom header used by Postmark to store the message ID in delivered emails.
- How to get the Postmark message ID after sending with postmark-rails
After delivering, read the Postmark response off the message: `message = UserMailer.welcome(@user); message.deliver_now; message.postmark_response` exposes the API response including the message ID, and `message.message_id` gives the standa