How to Send Emails in Symfony using SMTP or API Methods: A Step-by-Step Tutorial

A Symfony 7 email-sending tutorial explains how to install and configure the Mailer and Mime components, create Email or TemplatedEmail messages, and deliver them through Mailtrap using either SMTP credentials or an API transport. It demonstrates addressing options such as recipients, CC, BCC, and reply-to fields, as well as plain-text and HTML alternatives, Twig-based templates with CSS inlining, attachments, and embedded CID images. The material also covers asynchronous delivery through Symfony Messenger using queue back ends such as Doctrine, Redis, or RabbitMQ, requiring a worker to process queued messages. Separate approaches are presented for bulk sending through Mailtrap’s Bulk Stream, including a Symfony service that sends individual templated messages and an API-based bulk request implementation. Finally, it notes operational considerations including sender-domain verification, testing with Symfony’s mailer command, network and firewall access, SSL/TLS configuration, URL attachment requirements, and optional S/MIME signing and encryption.

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