[5.8] Storing Mailgun Message-ID in the headers after sending #28994
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This stores the message ID from Mailgun into the
X-Mailgun-Message-ID
header so that sendPerformed() can reference it. The same behaviour already exists for SparkPost (#18594) and SES (#16366).My personal use case is that it allows me to track individual emails (for open, click and spam complaint events) when I receive webhooks from Mailgun / SparkPost / SES.