You can also look up for these other topics: Framework Coding Standards Boilerplate CMS Tool Security Hacktoberfest
Comprehensive mailing tools for PHP
Symfony Swiftmailer Bundle
Helps sending emails
📧 Handy email creation and transfer library for PHP with both text and MIME-compliant support.
Library for using online Email providers
Aplus Framework Email Library
Yii 2 swiftmailer extension.