Overview
What Postmark is
Postmark is a transactional email service that sends and manages email through an API, with a focus on fast, reliable delivery.
Courier sits in front of it as one API, a visual editor, journeys, and every other channel, so you keep Postmark for delivery and build multi-channel notifications on top.
You need a Courier account and your own Postmark account with a Server API Token.
Why Courier
What you get with Postmark + Courier
Design beautiful emails, no code
Build and edit email in Courier's visual editor. Product and marketing change content and layout without shipping code, and everything still sends through Postmark.
Automate multi-step journeys
Onboarding, drip, and lifecycle sequences with delays and branching, all delivered through Postmark.
Add SMS, push, and chat
The same notification can reach every channel. Add one when you need it, with no new integration in your code.
Add an in-app inbox
A new, easy add-on: drop Courier Inbox into your web or mobile app so users get an in-product notification center alongside their Postmark email.
Localize a template in seconds
Pick a language and let Courier translate the whole template with AI, then tweak any string. One template, every market.
Send to lists and audiences
Broadcast a one-off or recurring message to an entire list through Postmark, alongside your transactional email.
Use cases
What teams build with it
Setup
Connect it in minutes
An admin adds Postmark once on the Integrations page in Courier. Once connected, anyone on your team can design and send email through Postmark, and add channels whenever they need them.
FAQ
Frequently asked questions
Can I use Postmark with Courier?
Yes. Postmark is a supported email delivery provider in Courier. Courier sends your transactional email through Postmark while adding template design, Journeys, and channels like SMS, push, and in-app inbox on one API.
Do I still need my own Postmark account?
Yes. Courier delivers through your Postmark account using its Server API Token, so Postmark still handles the actual sending, sender signatures, and your delivery reputation. Courier orchestrates the message and content on top.
What do I need to connect Postmark to Courier?
Two things: your Postmark Server API Token and a verified From address. Enter both on Courier's Postmark integration page and save. Recipients also need an email value on their Courier profile.
Can I set the Postmark message stream or add attachments?
Yes, through Courier provider overrides. Set the MessageStream parameter to target a specific stream, or pass an Attachments array with Name, Content, and ContentType fields to include files per message.
Can I use my existing Postmark templates with Courier?
Yes. Point the config to Postmark's withTemplate endpoint and include TemplateId and TemplateModel. Use the template parameter instead of content so your Courier overrides take precedence over the template.
Why is my Postmark email subject line getting cut off?
This is email client display behavior, not a Postmark limit. Postmark accepts long subject lines, but inboxes like Gmail, Outlook, and mobile clients only show the first 50 to 70 characters. Front-load the important words in your Courier subject line so it still reads well when a client truncates it.
Is Courier a replacement for Postmark?
No. Courier sits in front of Postmark, which still delivers your email. Courier adds the Send API, Journeys, and Design Studio, plus other channels like SMS, push, and Courier Inbox on one integration.
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