You asked about Email
42 people built something like it. 10 are gone.
That is 31% of the ones whose fate we could settle, against 23% across the whole register. 10 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-06-01 | YCMailmodo No-code email marketing platform to send forms & widgets within emails · mailmodo.com | acquired |
| 2014-06-01 | YCHive Marketing automation for event promoters (email, sms, ads, CRM) · hive.co | still up |
| 2020-06-01 | YCWarmly, [Acquired by HubSpot in 2026] Autonomous sales platform to auto-email… · warmly.ai | acquired |
| 2011-01-01 | YCMailgun Email API service. · mailgun.net | acquired |
| 2023-01-01 | YCResend Email for developers · resend.com | still up |
| 2014-01-01 | YCDyspatch AI Email Production - Emails on brand, guaranteed to work, fast. · dyspatch.io | still up |
| 2016-01-01 | YCMailTime Emails as quick and easy as text messaging. · mailtime.com | still up |
| 2024-01-01 | YCZaymo Interactive email builder for ecommerce brands · zaymo.com | still up |
| 2008-06-01 | Dead simple blogs by email · posterous.com | acquired |
| 2013-06-01 | YCHum A chat program that integrates with email, with presence. · letshum.com | gone |
| 2011-01-01 | YCInporia Fashion shopping email list. · inporia.com | gone |
| 2025-06-01 | Email Inboxes for AI Agents · agentmail.to | still up |
| 2022-01-01 | YCLoops Email sending for software companies · loops.so | still up |
| 2020-06-01 | YCMailwarm Prevents your emails from landing in spam. · mailwarm.com | still up |
| 2014-06-01 | PersistIQ is a free email automation platform to send a small batch… · persistiq.com | acquired |
| 2022-01-01 | YCFlike Flike's AI crafts sales emails that convert · flike.app | gone |
| 2021-01-01 | Cut your writing time by 40% with AI-powered autocomplete · compose.ai | still up |
| 2024-06-01 | YCApten Omnichannel AI agents that engage leads across SMS, voice, and email · apten.ai | still up |
| 2014-01-01 | YCEmailio Email built for wellness · emailio.com | still up |
| 2022-01-01 | Managed Sales Email Delivery For Cold Outreach · lightmeter.io | still up |
| 2021-06-01 | AI that solves email overwhelm. Not another mail app. · foragemail.com | gone |
| 2025-06-01 | YCSlashy Cursor for Email · slashy.com | still up |
| 2024-09-01 | The AI Assistant for Gmail · freestyle.ai | still up |
| 2024-06-01 | YCProxis The platform for enterprise AI agent automations, starting with email. · proxis.ai | still up |
| 2011-01-01 | YCUserfox User retention as a service. Drip email · userfox.com | gone |
| 2011-06-01 | YCZenbox Brings dozens of SaaS's (Mailchimp, Stripe, Shopify, Salesforce,… · zenboxapp.com | gone |
| 2012-01-01 | YCGlider We filter distracting emails away from your inbox. · glider.io | gone |
| 2015-01-01 | YCOutbound Create automated messages -- email, iOS/Android push, SMS and web… · outbound.io | acquired |
| 2016-06-01 | YCPolymail Email productivity platform for business. · polymail.io | acquired |
| 2017-06-01 | YCSlik Slik enables the long tail to use email outreach. · slik.ai | gone |
| 2014-01-01 | Mailing lists 2.0.
Threadable makes group email less noisy and more… · threadable.com | gone |
| 2012-06-01 | Easy mailing lists · zeromailer.com | acquired |
| 2010-06-01 | Add profiles to email. · rapportive.com | acquired |
| 2025-01-01 | YCCedar Execute the best sales playbook in industry · mail.cedarcopilot.com | still up |
| 2024-06-01 | YCOdo Your email assistant because you deserve a better morning · useodo.com | still up |
| 2024-01-01 | Helping Companies Deploy Email Agents in High Trust Domains · breezlabs.com | still up |
| 2009-01-01 | YCreMail Email search for iPhone. Acquired by Google in Feb 2010. · remail.com | acquired |
| 2025-01-01 | YCStamp The AI Secretary for Email and Calendar. · stampmail.ai | still up |
| 2017-06-01 | FollowUpThen is an email-based personal assistant that sends you… · followupthen.com | still up |
| 2026-09-01 | YCAsakana AI order entry for food distributors: emails and texts to ERP · asakana.co | still up |
| 2010-06-01 | YCPost.fm New email inbox. · post.fm | gone |
| 2021-01-01 | YCWaypoint The email API built for product teams · usewaypoint.com | still up |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.