How to use Android JavaMail API to Send Emails

Android applications can send email through Intents, but this approach depends on installed email clients and user interaction, making it unsuitable for automated, scheduled, bulk, or highly customized messages. JavaMail and email APIs offer greater control through SMTP or direct HTTP requests, supporting HTML content, multiple recipients, attachments, delivery logging, and background sending without blocking the user interface. Implementation requires mail or HTTP dependencies, internet permission, authenticated sending domains, and asynchronous network operations, with Mailtrap used as an example provider for SMTP credentials and API tokens. The material emphasizes secure credential and token storage, HTTPS communication, input validation, detailed error handling, and additional protections for attachments, such as encryption, checksums, malware scanning, and digital signatures.

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