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Mailozaurr
Mailozaurr is a PowerShell module that aims to provide SMTP, POP3, IMAP and probably some other ways to interact with Email. Underneath it uses MimeKit and MailKit libraries written by Jeffrey Stedfast.
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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.
Google still allows app passwords for SMTP mailing on 587. You can use PowerShell or whatever to send it. I really like the Mailozaurr module for email (https://github.com/EvotecIT/Mailozaurr) and it even supports Google oAuth2.
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.