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inbucket
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.
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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.
anonaddy provides a docker image for their email forwarding service, you can create and manage as much addresses as you want and have all emails forwarded to your main addy: https://github.com/anonaddy/docker
inbucket is what you need
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.