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That is utterly simple, and can be readily converted for usage with cURL through PHP without loading any external libraries. No symfony/mailer. No PHPMailer/PHPMailer. Nothing.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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That is utterly simple, and can be readily converted for usage with cURL through PHP without loading any external libraries. No symfony/mailer. No PHPMailer/PHPMailer. Nothing.
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.