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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.
The easiest way to send e-mails (from a beginner POV) is PHPMailer connected to an existing and configured SMTP server. Does your school has one? If yes, you're all set.
Most hosting providers also provide SMTP that you can use, if you have one. Or, there are plenty of online services with a free tier that you can use. Stuff like Sendgrid, Mailchimp, Postmark and SparkPost just to name a few (those services usually provide a SDK to integrate, or can be used with something like symfony-mailer).
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.