Developer’s Guide on Sending HTML Emails in Go: SMTP and Email API Covered

The article explains how to send HTML emails in Go 1.13 or later through Mailtrap using either SMTP with the Gomail package or Mailtrap’s HTTP email API. It covers account setup, domain verification, SMTP credentials, and constructing messages with HTML bodies while recommending a plain-text alternative for compatibility. Examples demonstrate adding file attachments, embedding inline images through content IDs, and generating personalized messages with Go’s html/template package or API payload variables. It also describes using inline CSS for broadly compatible email styling, rendering templates into message bodies, and encoding API attachments and images in Base64. The API approach uses authenticated JSON HTTP requests and includes both HTML and text fields, while the conclusion points readers to additional resources for bulk, asynchronous, and general HTML email practices.

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