We bill based on the number of messages our Outbound Filtering service analyzes. This includes outbound spam messages. Preventing the spam from being delivered is part of the value we offer, which is why we charge for these messages. We have capabilities built-in to reduce your exposure to bursts in volume resulting from a spam attack; if your account suddenly sends much more volume than usual, we will rate-limit the account. If we detect unusual activity, we will notify you (you must have notifications enabled in the MailChannels Host Console).
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