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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.
I use aerc, which is similar to this, but written in Go. Most of these TUI mail clients have a configurable filter option for different MIME types. I've found that this program does a great job as an HTML to text filter:
https://github.com/jaytaylor/html2text
I think the classic approach is to use something like lynx or w3m with networking disabled, but I wasn't impressed with the output.
You're probably looking for notmuch, which integrates very well with other tools. There's also mblaze (https://github.com/leahneukirchen/mblaze) that might be of interest.