PHPMailer Guide: Configuration, SMTP Setup, and Email Sending

PHPMailer is an open-source PHP library for sending email through SMTP, PHP mail(), Sendmail, or qmail, with features including authentication, TLS/SSL encryption, address validation, attachments, embedded images, HTML and plain-text alternatives, and multiple recipient fields. The tutorial explains installing version 6.9 through Composer or manually loading required classes, then configuring an SMTP host, credentials, encryption, and port, using Mailtrap as an example provider. It demonstrates sending plain-text and HTML messages, adding CC, BCC, reply-to recipients, mailing lists, file or string attachments, and CID-embedded images. Because PHPMailer operates synchronously, background delivery can be handled by launching a CLI script, while high-volume delivery can reuse SMTP connections or use a queue system such as RabbitMQ with producer and worker scripts. It also describes SMTP debugging levels and shows how diagnostic output can identify configuration issues such as invalid hostnames or login credentials.

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