How to Send Emails in Flask Using Gmail Email Infrastructure

Flask applications can send email through Gmail using either SMTP with Flask-Mail or the Gmail API, with SMTP requiring a Google app password because less-secure app access is no longer supported. The configuration uses Gmail’s SMTP server with TLS or SSL settings, and credentials can be stored in environment variables rather than hard-coded; Flask-Mail messages can also target multiple recipients and include attachments or HTML content. The Gmail API approach involves creating a Google Cloud project, enabling the API, configuring OAuth 2.0 credentials, installing Google client libraries, authorizing users, and sending Base64-encoded MIME messages. Gmail imposes quotas, daily sending limits, attachment-size limits, bandwidth and concurrency restrictions, and limited support options, which may make it less suitable for high-volume or advanced delivery needs. The tutorial presents Mailtrap Email Sending as an alternative SMTP and API provider offering higher throughput, analytics, logs, deliverability alerts, authentication support, dedicated assistance, and separate transactional and bulk email streams.

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