---
title: "Postmark API changes, deprecations and deadlines | Harbyn"
description: "Postmark: 0 upcoming deadlines and 1 recorded change as of 2026-10-25, each with its source."
canonical: "https://harbyn.com/vendors/postmark"
last-updated: 2026-09-29
---

# Postmark: API changes and deadlines

Markdown version of <https://harbyn.com/vendors/postmark>.

Messaging. 0 upcoming deadlines, 1 recorded change. Every entry cites the Postmark page we read it from.

## What we read

The Postmark pages and feeds our ingestion visits, politely and on a schedule.

- **Changelog**: <https://postmarkapp.com/updates/feed.atom>
- **Releases**: <https://api.github.com/repos/ActiveCampaign/postmark.js/releases?per_page=20>
- **Changelog**: <https://api.github.com/advisories?affects=postmark&per_page=20&sort=published&direction=desc>

## What the scanner looks for

How `harbyn scan` recognises Postmark in a repository, on your machine. Nothing leaves it.

- **Packages**: `npm postmark`
- **API hosts**: `api.postmarkapp.com`

## Upcoming deadlines

No upcoming Postmark deadline in the feed right now.

## Change history

Newest first, by the date Postmark announced it. This is the archive: past changes are not warnings, and changes we recorded after they took effect are marked as such.

### September 2026

- Sep 23, 2026, Feature: [2FA is now available on the free Developer plan](https://postmarkapp.com/updates/2fa-is-now-available-on-the-free-developer-plan)