Framework guides

Frameworks and languages

What your application sends mail with.

• Laravel

  Point Laravel's mailer at a sandbox with five environment variables — no package, no code change.

• Symfony

  One DSN in .env.local sends every Symfony Mailer message to a sandbox.

• Django

  Five settings send everything django.core.mail produces to a sandbox.

• Ruby on Rails

  Action Mailer talks to a sandbox with one smtp_settings block per environment.

• Node.js

  A Nodemailer transport pointed at a sandbox, and every sendMail lands there.

• Next.js

  Send from a Route Handler or a Server Action — the sandbox catches it like any other SMTP client.

• Go

  The standard library speaks SMTP; net/smtp needs nothing installed.

• Spring Boot

  Spring Boot's mail starter reads five properties — point them at a sandbox.

• Java (Jakarta Mail)

  Jakarta Mail with a Session and an authenticator — no framework involved.

• .NET

  MailKit against a sandbox — connect, authenticate, send.

• PHP (PHPMailer)

  PHPMailer against a sandbox, without a framework in the way.

• Python

  smtplib is in the standard library — nothing to install.

• Rust

  lettre, with a STARTTLS relay pointed at a sandbox.

Command line

One command, no project — the quickest way to check the credentials.

• cURL

  One command, no project — the fastest way to prove the credentials work.

• swaks

  The SMTP swiss army knife: one command that prints the whole conversation.

• msmtp

  A sendmail-compatible relay for cron jobs, scripts and anything that shells out to sendmail.

• PowerShell

  A one-liner from Windows, for scripts and scheduled tasks.

Servers and applications

Software that sends its own mail: relays, CMSes, admin tools.

• Postfix

  Relay a whole machine's outgoing mail into a sandbox — every application on it, without touching any of them.

• Docker Compose

  Hand the sandbox credentials to a service as environment variables — no container to run alongside it.

• WordPress

  Send wp_mail() — and every plugin that uses it — to a sandbox instead of the site's host.

• GitLab

  Catch a self-managed GitLab's notifications without mailing the whole team.

• Grafana

  Check what an alert actually looks like, without waking anyone up.

• Keycloak

  See the verification and reset emails a realm sends, exactly as a user would get them.

Not listed?

Mailclutch is a plain SMTP server, so anything that can send mail can send here — the four values above are all any client needs. The SMTP setup page covers the ports, the encryption and what to do when a connection is refused.