How to Send Emails in Rust: SMTP and email API Methods Explained

Rust applications can send email through SMTP, HTTP APIs, or a locally configured sendmail-compatible program, with the lettre crate presented as the primary cross-platform SMTP option. The walkthrough explains how to configure lettre dependencies, credentials, SMTP relay endpoints, and STARTTLS, noting that Mailtrap requires domain verification and TLS to avoid authorization errors. It adapts the basic SMTP approach for plain-text and HTML messages, multipart emails with inline and regular attachments, and multiple recipients through To, CC, and BCC fields. As an alternative, it demonstrates using the asynchronous reqwest and tokio libraries to submit JSON email payloads to the Mailtrap Email API, including response-status and error handling. The sendmail crate offers another option for Unix-like systems, but depends on an installed and configured system sendmail command, making it less portable than lettre.

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