Yes! If you have a campaign or large batch of emails getting queued into your account's backlog, we'll reserve an extra 5% of your hourly quota so more critical emails such as password resets or order confirmations can send without delay.
Prioritize important messages
important option (API) or
X-MC-Important (SMTP) to flag important messages and give them priority over other messages you're currently sending. The value should be True to prioritize the message and False to not prioritize it.