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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you did in fact want to shift your SMS workload from SNS to Twilio, I would recommend that you also check out Sendgrid to handle your outbound email workloads. Sendgrid is owned by Twilio.
I've also heard good things about Postmark and have personally used and had no problem with Mailgun.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.