When comparing Flowmailer vs SparkPost, the Slant community recommends SparkPost for most people. In the question“What are the best alternatives to Mandrill?” SparkPost is ranked 6th while Flowmailer is ranked 9th. The most important reason people chose SparkPost is:
SparkPost supports both SMTP and REST APIs and has client libraries supportings many languages including nodejs, python, php, ruby, go, elixir, and java.
Specs
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Pros
Pro Provides lightning-fast delivery (<1 sec avg) | SPF, DKIM and DMARC alignment
Pro Built for developers
SparkPost supports both SMTP and REST APIs and has client libraries supportings many languages including nodejs, python, php, ruby, go, elixir, and java.
Pro Best Inboxing of any provider by almost 10 points, supported by third party data
SparkPost delivers more messages to the inbox than any other provider, not just to the recipient, to the actual inbox. So while almost every company will claim high 90's on deliverability, Sparkpost is the only one that's been able to demonstrate high 90's on inbox placement as well. This has real revenue impact.
Pro Responsive and helpful support
The support team at SparkPost is extremely responsive to questions and goes above and beyond to solve any challenges and help customers get the most out of their messaging.