Send Emails with Gmail API

Gmail API provides REST-based access to Gmail functions, allowing applications to send and receive HTML emails and attachments, manage drafts, messages, threads, labels, mailbox history, and settings, and perform searches and access-control operations. The setup process involves creating a Google Cloud project, enabling the Gmail API, configuring OAuth 2.0 consent and credentials, selecting a language-specific quickstart guide, installing a client library, and authorizing access to a Gmail account. Applications can create MIME-formatted, Base64URL-encoded messages or drafts and send them through the messages.send or drafts.send endpoints, while also retrieving messages and downloading attachments by message ID. The material contrasts Gmail API’s HTTP- and OAuth-based approach with traditional SMTP, noting that SMTP relies on TCP connections and account credentials, whereas the API supports scoped authorization, automation, and extensive mailbox management but remains subject to Gmail sending limits, API quotas, and a 25 MB message-size limit. It also presents Mailtrap Email API as an alternative focused on high-volume delivery, analytics, logs, webhooks, and deliverability controls, available through either API or SMTP integration.

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