SwiftMailer is a flexible, object-oriented PHP library for sending emails via SMTP, Sendmail, or other transports (including third-party APIs). It supports features essential to robust email sending: attachments, HTML vs. plain text bodies, inline images, MIME types, message queues, and signed messages via DKIM. The API lets developers build richly composed messages with multiple parts, headers, and encodings without dealing with raw mail formatting. With built-in retry logic, logging, and...