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Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
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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.
MailSpring is either done to look at soon ... it's either very close to finalizing Bridge support or in fact done. It's not clear to me, there's a discussion in GitHub. Nice thing about MailSpring is that it has a Linux client (Postbox only has Mac and Windows).
Mailspring and Thunderbird are recommended.
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.