Code Examples
Ready-to-run, production-ready examples for mx.msgwing.com:465 (SSL/TLS) or :587 (STARTTLS), one file per language — all in the GitHub repository:
| Language | File |
|---|---|
| Python | python-zerosmtp.py |
| PHP (PHPMailer) | php-zerosmtp.php |
| PHP (Symfony Mailer) | php-symfony-mailer-zerosmtp.php |
| Node.js | node-zerosmtp.mjs |
| TypeScript | ts-zerosmtp.ts |
| Bash (curl) | bash-curl-zerosmtp.sh |
| Bash (swaks) | bash-swaks-zerosmtp.sh |
| Java | java-zerosmtp.java |
| C# (.NET / MailKit) | cs-zerosmtp.cs |
| Go | go-zerosmtp.go |
| Ruby | ruby-zerosmtp.rb |
| Rust | rust-zerosmtp.rs |
| Kotlin | kotlin-zerosmtp.kt |
| Elixir | elixir-zerosmtp.exs |
| Lua | lua-zerosmtp.lua |
| Perl | perl-zerosmtp.pl |
| C (libcurl) | c-zerosmtp.c |
| Dart | dart-zerosmtp.dart |
| Zig (libcurl) | zig-zerosmtp.zig |
| Swift | swift-zerosmtp.swift |
| PowerShell | pwsh-zerosmtp.ps1 |
The Elixir, Lua and Dart examples were contributed by @slegarraga in #83, #84 and #85. Every example here is run in CI on each change, so a language nobody on this project writes daily stays correct rather than quietly rotting.
Missing a language you use? A working example is a genuinely useful contribution and it gets credited here by name.
Deployment recipes
Not every migration is a code change — often the SMTP settings live in a configuration management tool or a container definition instead:
| Recipe | File | What it does |
|---|---|---|
| Ansible | ansible-zerosmtp.yml | Points a fleet’s system mailer (cron, unattended-upgrades, systemd OnFailure=) at the relay via msmtp. See Linux setup for the manual equivalent. |
| Docker Compose | docker-compose-zerosmtp.yml | Sends one message from a container, reading credentials from .env. |
| GitHub Actions | github-actions-zerosmtp.yml | Emails a workflow’s own failures through the relay via dawidd6/action-send-mail, so a broken deploy or a quietly-stopped scheduled job doesn’t go unnoticed. Testable on demand via workflow_dispatch, without waiting for a real failure. |
Each example reads credentials from ZEROSMTP_* environment variables (ZEROSMTP_USERNAME, ZEROSMTP_PASSWORD, ZEROSMTP_FROM, ZEROSMTP_TO, ZEROSMTP_SUBJECT) — never hardcode real credentials into a script.
See the Quickstart for how to get @msgwing.com credentials, and Troubleshooting if a send hangs or fails.
Updated 30 Aug 2026