Open-source n8n templates for bulk email verification — Sheets, CSV cleanup, signup webhook, AI agent tool (EN/中文)

I built a set of four n8n templates around one job: checking whether email addresses are worth sending to, before they go into a sequence, a CRM, or an agent's hands.

A few details that took longer than expected

Everything uses the core HTTP Request node (no community node) and a Header Auth credential, so nothing secret lives in the JSON. Chinese versions of all four are included.

Also in the repo: an OpenAPI file (imports into Dify, Coze, GPT Actions), MCP config, and llms.txt.

Disclosure: the templates are MIT, but they call an email-verification Actor I built and run on Apify, which is pay-per-verified-address (there's a free tier).

Repo: https://github.com/sumitrmardy/email-verifier-api

Feedback welcome — especially from anyone on a different n8n version where a node imports differently. That's the part I'd most like to hear about.