Send emails in Go using Gmail SMTP and API

A Go email-sending tutorial outlines two Gmail-based approaches compatible with Go 1.13 and later: Gmail SMTP with an app-specific password and the Gomail package, and the Gmail API using a Google Cloud project, enabled API access, OAuth 2.0 credentials, and base64-encoded MIME messages. It demonstrates sending plain-text and HTML messages, providing text alternatives for HTML clients, addressing multiple recipients with To, Cc, and Bcc fields, and adding attachments through Gomail or manually constructed MIME content for the API. Gmail SMTP is presented as relatively simple to configure, while the API requires more extensive OAuth setup but supports automated sending workflows. The tutorial also notes Gmail constraints, including a 500-email daily SMTP limit, API quotas and rate limits, a 25 MB attachment cap, and limited delivery analytics, dedicated-IP options, and direct support. It presents Mailtrap as an alternative production email platform, describing SMTP and API integration for Go along with features such as scalable delivery, analytics, separate transactional and bulk streams, detailed logs, and customer support.

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