How to Send Emails in Go using SMTP or Email API

Sending email in Go can be accomplished through third-party packages, native SMTP support, Google App Engine’s mail service, or an email API, with examples compatible with Go 1.13 and later. Gomail is presented as a flexible community package that works with an external SMTP provider and supports TLS, attachments, embedded images, HTML and text alternatives, templates, and character encoding, while the Google App Engine mail package uses Google APIs but has limited functionality and sending quotas. Go’s built-in net/smtp package can send basic plain-text messages with PlainAuth or CRAM-MD5 authentication, but it is frozen and lacks modern features such as TLS, MIME attachments, DKIM, templates, and queueing. The tutorial demonstrates using Mailtrap SMTP or its Email API to send plain-text and HTML messages, address multiple recipients, attach or embed files, and send messages asynchronously or in bulk through goroutines, wait groups, and throttling. It also emphasizes verifying a sending domain, using valid credentials and API tokens, including plain-text fallbacks for HTML email, base64-encoding API attachments, and applying rate controls to support deliverability during high-volume sending.

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