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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.
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maildir-tools
Discontinued Golang-based utility which can be used for scripting Maildir things, and also as a basic email client
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Tangentially related: I really like the approach of mu [1]. Let other software (like mbsync) handle IMAP synchronization of a local maildir, let other software (like msmtp) handle sending, and focus on doing really good, flexible and efficient queries of the local maildir. Then you can build whatever thin, simple GUI on top of that.
[1] https://www.djcbsoftware.nl/code/mu/
Aerc looks amazing, but I am still waiting for threading support before making the jump [1]. To the best of my knowledge, it supports everything else I would need.
[1]: https://todo.sr.ht/~sircmpwn/aerc2/94
My current stack is: Mutt, Neovim, fdm, msmtp, Syncthing, notmuch, lynx (for HTML conversion), mblaze [2] (for scripting), and a tiny pair of scripts to snooze and unsnooze e-mails. Here is an interesting observation, although a pipeline like this may look terrifying, it makes swapping in Aerc to take it for a spin trivial since it all interacts with a Maildir.
[2]: https://github.com/leahneukirchen/mblaze
Small world! I wrote something similar for scripted access to Maildirs:
https://github.com/skx/maildir-tools
The trick seems to be caching mail headers, https://gitlab.com/muttmua/mutt/-/wikis/MuttGuide/Caching
Also if you change folders frequently you can put: