{"slug": "show-hn-goodsender-the-email-api-for-makers-and-ai-agents", "title": "Show HN: GoodSender – the email API for makers and AI agents", "summary": "GoodSender launched an email API designed to ensure messages land in recipients' inboxes by enforcing permission-based sending and monitoring engagement signals. The service, built on infrastructure used by the world's largest email senders, offers 100,000 free emails per month and automates deliverability through consent workflows, engagement scoring, and automatic list hygiene. GoodSender aims to solve the persistent problem of emails landing in spam by making deliverability an earned, automated process for smaller teams and AI agents.", "body_md": "Send emails that land in the inbox by default — permission enforced, engagement monitored, on the stack we built for the world's largest senders. 100,000 emails a month, free.\n\n“Deliverability isn't infrastructure — it's earned. GoodSender automates the earning: permission, engagement, reputation. The way email was always supposed to work.”\n\nMarketing email starts with permission. Every recipient confirms before you can reach them — enforced at the API. Once they're in, send away. Mailbox providers reward this. So do we.\n\nSend a consent request to any email address. It takes ~150ms.\n\nThey click a link in a standard, high-reputation system email.\n\nThe recipient is unlocked for your API key globally.\n\nHit /v1/emails/send with markdown, HTML, or plain text. We render, suppress, and deliver from the high-reputation pool.\n\nPick a template, pass your variables, and it's in the inbox. Transactional emails are pre-cleared — no consent workflow required.\n\nVerify a user as they turn on multi-factor authentication.\n\nAlert users when their account is accessed from a new device.\n\nMagic-link or one-click sign-in without a password.\n\nConfirm a successful checkout with receipt-ready details.\n\nOne-time passcodes for 2FA and passwordless login.\n\nWe expand the catalog over time based on what customers ask for.\n\nPermission opens the door. Engagement keeps it open. We watch every signal — opens, clicks, complaints, silences — and handle list hygiene so your sender reputation only goes up.\n\nOpens, clicks, bounces, and complaints — tracked per recipient, aggregated into a live engagement score by our agents.\n\nSix months without engagement triggers an automatic re-permission ping. No response? They drop off your list — not your problem.\n\nUnsubscribes and spam complaints are suppressed instantly across your workspace. You physically cannot send to them again. Reputation: protected.\n\nAll of it lives behind a single endpoint. Pass markdown, HTML, or plain text — we handle rendering, suppression, and delivery on the shared high-reputation pool.\n\n```\ncurl -X POST https://api.goodsender.com/v1/emails/send \\\n  -H \"Authorization: Bearer <your-api-key>\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\n    \"emails\": [\n      {\n        \"from\": { \"email\": \"sender@example.com\", \"name\": \"Example Sender\" },\n        \"to\": [{ \"email\": \"recipient@example.com\" }],\n        \"subject\": \"Hello from GoodSender\",\n        \"markdown_content\": \"## Hello from GoodSender\\nYour first email is on the way.\"\n      }\n    ]\n  }'\n```\n\nNo template language. No rendering pipeline. Pass the model output directly — we handle the conversion to bulletproof email HTML.\n\nDraft the next issue in your assistant, pick the audience, send. New subscribers get a consent request in the background — their first issue goes out the instant they confirm.\n\nDraft the next issue and preview it right inside Claude, ChatGPT, or your terminal. Refine until it looks right — no copy-pasting between tabs.\n\nSend to the whole list, a segment, or a fresh batch of emails. Your agent lines up the audience in plain language.\n\nShip now or schedule it via your assistant's task system. New subscribers get a consent request in the background — their issue goes out the moment they confirm.\n\n2009 — our founders built SendGrid to help developers solve the problem of emails landing in spam. The cloud infrastructure shipped. The deliverability problem didn't go away. Deliverability is earned, not built.\n\n2018 — we left the space. Years later, the core problem was still there. Senders were still fighting for the inbox.\n\n2025 — we built [Laneful](https://laneful.com/): email engineers, custom IP lanes, and AI agents that monitor traffic health for the largest senders in the world. Tailored involvement that reduces ESP costs and earns top-tier deliverability at scale.\n\nToday — GoodSender is that same playbook, automated. Permission, engagement, and reputation wired into a single API for smaller teams and AI agents.\n\nWhen every recipient consented and every list is healthy, infrastructure costs collapse. We pass the savings on. 100K free / month, $1 per 100K beyond. Here's how that compares:\n\nFirst 100k emails/month free — covers everything you send, transactional and marketing alike. Practically free for most businesses at any realistic volume.\n\nBeyond your free 100k — $1 per additional 100k. No subscriptions, no surprises.\n\nTransactional templates — MFA, New Device, Login, Order Completed, OTP — don't require permission. Catalog grows with customer demand.\n\nswipe swipe to compare\n\n| PROVIDER | 100K/MO | 500K/MO | 1M/MO | 10M/MO |\n|---|---|---|---|---|\n| Resend | $35 | $350 | $650 | CUSTOM |\n| SendGrid (Twilio) | $34.95 | $499 | $499 (700K) | CUSTOM |\n| Mailtrap | $30 | $300 | $750 | CUSTOM |\n| Mailgun | $75 | $400 | $700 | CUSTOM |\n| Amazon SES | $10-12 | $50-60 | $100-120 | CUSTOM |\n| GoodSender | $0 | $4 | $9 | $99 |\n\n// 100K and 1M prices verified on competitor pricing pages on 2026-04-20. SendGrid has no published 1M tier — the figure shown is the closest published one (700K = $499). 500K and 10M remain approximate. Competitor pricing may vary by plan, volume tier, and billing period.\n\nNeed enterprise-grade volume?\n\nAdd your domain, grab an API key, and send your first email — with permission and engagement built in — in under 10 minutes.", "url": "https://wpnews.pro/news/show-hn-goodsender-the-email-api-for-makers-and-ai-agents", "canonical_source": "https://goodsender.com/", "published_at": "2026-05-31 06:21:32+00:00", "updated_at": "2026-05-31 06:45:13.250157+00:00", "lang": "en", "topics": ["ai-products", "ai-tools", "ai-infrastructure", "ai-startups"], "entities": ["GoodSender"], "alternates": {"html": "https://wpnews.pro/news/show-hn-goodsender-the-email-api-for-makers-and-ai-agents", "markdown": "https://wpnews.pro/news/show-hn-goodsender-the-email-api-for-makers-and-ai-agents.md", "text": "https://wpnews.pro/news/show-hn-goodsender-the-email-api-for-makers-and-ai-agents.txt", "jsonld": "https://wpnews.pro/news/show-hn-goodsender-the-email-api-for-makers-and-ai-agents.jsonld"}}