fix: support for Cloudflare Workers, and other non-Node environments

[gabrielmfern]

Closes #817, swaps from using mailparser to using postal-mime which is actually meant to be used anywhere, without any dependencies. It has much, much fewer downloads, but socket gives it a good score, as well as the publisher for it is the same person as for mailparser, so I think we're safe to trust it.

The tests pass, and I've tried using it with a real email template and things seem to work properly.

---

Summary by cubic

Switched email parsing to PostalMime to support Cloudflare Workers and other non‑Node runtimes. Standardized attachment handling to base64 for consistent processing.

• Dependencies

  • Replace mailparser with postal-mime.

• Refactors

  • Parse raw emails with PostalMime.parse in receiving.ts using attachmentEncoding: "base64".
  • Update attachment fields: content is base64, content_type uses mimeType.

^{Written for commit 0fafb2a. Summary will update on new commits.}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	postal-mime@​2.7.3

View full report

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/resend/resend-node/resend@820

commit: 0fafb2a

[cubic-dev-ai]

No issues found across 3 files