chore(deps): update dependency postmark to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postmark (source)	4.0.7 → 5.1.0

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Release Notes

ActiveCampaign/postmark.js (postmark)

v5.1.0

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• added support for the Bulk Email API (#​185):
  • ServerClient.sendBulkEmail() — send a bulk email (POST /email/bulk)
  • ServerClient.getBulkEmailStatus() — poll a bulk request's status (GET /email/bulk/{bulk-request-id})
  • new models BulkEmailRequest, BulkEmailMessage, BulkEmailSendingResponse, BulkEmailStatusResponse, and the BulkEmailStatus enum, with BulkEmailRequest/BulkEmailMessage exposed as top-level exports

v5.0.0

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Migrated the HTTP client from axios to the native Fetch API, making the SDK dependency-free.
This is a major release; the migration introduces five breaking changes, detailed below.

Breaking changes

1. Minimum Node version is now 18.0.0 (dropped Node 14 and 16). The native Fetch API requires Node 18+.
2. Proxy environment variables (HTTP_PROXY / HTTPS_PROXY / NO_PROXY) are no longer honored automatically. axios read them via proxy-from-env, but Node's built-in fetch (undici) does not. To route requests through a proxy, pass a custom fetch via the new fetch client option (e.g. bound to an undici ProxyAgent dispatcher) — see the README "Proxies / custom fetch" section.
3. An empty 2xx response body now resolves to {} instead of the empty string "" that axios surfaced.
4. client.httpClient.client is no longer an axios instance — it is now a fetch function. Code that reached into it to add axios interceptors, set defaults, or attach an axios adapter/proxy will no longer work; use the new fetch client option for transport customization instead.
5. Request timeout semantics changed. With axios timeout was a response/inactivity timeout; it is now mapped to AbortSignal.timeout(), which is a total deadline for the entire request. Slow-but-progressing responses that previously completed may now abort once the total duration exceeds the configured timeout.

Other changes

• removed the axios dependency (resolves CVE exposure and url.parse() deprecation warnings, and restores compatibility with Edge/Workers runtimes)
• added the fetch client option, allowing a custom fetch implementation to be supplied for proxy support, testing, or other transport customization

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Project	Deployment	Actions	Updated (UTC)
ark-docs	Ready	Preview	Jul 23, 2026 2:47pm