MailSlurp guide agent setup

Title: You can use the `mailer` package in Dart to send and receive emails.
Description: How to compose mail and download emails in Dart or Flutter
Canonical URL: https://www.mailslurp.com/guides/send-email-dart/
Markdown URL: https://www.mailslurp.com/guides/send-email-dart.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.