Features

Mailer To Go is transactional email built for developers: authenticated sending, managed deliverability, and setup measured in minutes — not DNS tickets. Here’s what you get.

Send from any stack (SMTP)

Send over standard SMTP on port 587 (STARTTLS) or 465 (SSL). Because it’s ordinary SMTP, every framework’s built-in mailer already works — Rails ActionMailer, Django, Nodemailer, Laravel, Go’s net/smtp, and anything else. Point your mailer at the credentials in your dashboard and you’re sending. See the multi-language quickstart.

A JSON REST API (POST /api/v1/emails) is in development for teams who prefer an HTTP call to an SMTP connection.

Authentication, handled

Deliverability starts with proving you’re allowed to send. Mailer To Go sets you up with SPF, DKIM, and DMARC aligned to your domain, and shows you exactly which records to publish. Full explainer: email authentication, end to end.

Managed sending domains and subdomains

Send from a dedicated subdomain like mtg.yourdomain.com to keep your root domain’s reputation isolated from your app mail. With delegated setup, you publish one NS record and we publish and auto-rotate your SPF/DKIM/DMARC for you — and it’s revocable anytime by removing that record. Details: why we send from mtg.yourdomain.com.

Reputation and suppression, managed for you

Your mail rides on managed, monitored sending infrastructure. Hard bounces and spam complaints are captured and added to your suppression list automatically, so you don’t re-mail addresses that will hurt your reputation — the discipline that keeps you in the inbox.

Delivery events

Configure webhook URLs in your dashboard to receive real-time notifications for delivered, bounced, opened, and clicked events, so your app can react to what happens after you hit send.

Analytics

See your sending at a glance — volume over time and delivery-rate metrics — so you can spot problems before they become deliverability issues.

Works with your platform

Mailer To Go is a first-class add-on on Heroku, Addons.io, and Build.io: provision it and your SMTP credentials are set as config vars automatically. See sending from Heroku.

Frequently asked questions

Do my recipients see the subdomain? No. The subdomain authenticates your mail behind the scenes; the From: address recipients see stays on your root domain.

Which languages and frameworks are supported? Any that can send SMTP — which is all of them. See examples in Ruby, Python, Node.js, and Go.

Is there a REST API? It’s in development (POST /api/v1/emails). Today, send over SMTP.

Can I migrate from another provider? Yes — see the guides for SendGrid, Mailgun, and Amazon SES.

Ready to send? Get started or read the documentation.