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Mass messages go out through the messages resource’s queue lifecycle. You create a queued mass message, then track its delivery and buyers.

Targeting with lists

Build the audience first with lists, then target the list when creating the mass message. Criteria-based list adds (addTopSubscribers, addQueueBuyers, …) make it easy to re-engage a cohort.

Reply-on-subscribe

messages also supports a reply-on-subscribe template — an automatic message sent when a new fan subscribes. Set it once and new subscribers receive it without a per-fan call.
Mass messages are rate-sensitive. Stagger large campaigns and watch for 429 / upstream rate-limit problems — see Rate limiting.