SparkPost
High-volume sender with deep analytics, now folded into Bird's platform.
Compared on toolweight in:Email APIs
Related comparisons:AU SMS APIs
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What SparkPost is
SparkPost came out of Message Systems' on-premise MTA business and carried genuine deliverability engineering into the cloud: automatic IP warmup, detailed engagement analytics and very high throughput. Since the MessageBird acquisition it has been progressively absorbed into Bird, self-serve access has narrowed, and pricing above small volume goes through sales. Existing users are well served; new ones should check what they can still sign up for.