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Use cases

What will you send?

PostStack is one EU-hosted platform for every kind of email a product sends and receives. Start from the job you need done.

Transactional email that arrives in seconds

The emails your users are waiting for — sign-in links, password resets, receipts — sent from European infrastructure with one API call, signed with your own domain.

  • API
  • SMTP
  • Webhooks

Newsletters and product updates, from the same platform as your app email

Keep your contacts, segments and campaigns next to your transactional email. Send from the dashboard, the API or your AI agent, and let unsubscribes take care of themselves.

  • Broadcasts
  • Segments
  • A/B tests

Let your AI agent send the email

PostStack ships a Model Context Protocol server, so an agent can look up a contact, render a template, check the result and send — through the same pipeline, suppressions and limits as your API.

  • MCP
  • OAuth
  • Audit log

All of your product’s email, in one place

Sign-up confirmation on day one, onboarding through the trial, release notes every month — and, when your customers ask, email sent from their own domains.

  • Workflows
  • Multi-domain

Order emails your customers actually receive

Order confirmations, shipping updates and receipts, sent from your own domain through European infrastructure — whether your shop speaks SMTP or you call an API.

  • SMTP
  • Templates
  • Receipts

Email addresses on your own domain

you@yourcompany.com, in every mail app and in the browser, for €1 a mailbox a month — on the same platform that sends your app’s email.

  • IMAP
  • Webmail

An email API that keeps your data in Europe

Email addresses, names and message content are personal data. PostStack processes all of it inside the EU, under a European company, with the paperwork your DPO will ask for.

  • EU
  • DPA
  • Sub-processors