---
title: "Comment by Duko tools on \"I built an open-source AgentMail alternative on Cloudflare Workers\" | Hashnode"
description: "\"An address nobody has created is treated differently\", the ALLOW_UNKNOWN_INBOX flag is the one config choice I'd actually lose sleep over here. Leave it open o"
url: "https://hashnode.com/posts/open-source-agentmail-alternative-cloudflare-workers/6aa678994022e77333d11b8d/comment/6aab97b112258031443d2bcf"
---

[Discussion](https://hashnode.com/posts/open-source-agentmail-alternative-cloudflare-workers/6aa678994022e77333d11b8d)

Comment [I built an open-source AgentMail alternative on Cloudflare Workers](https://hashnode.com/posts/open-source-agentmail-alternative-cloudflare-workers/6aa678994022e77333d11b8d)

[Duko tools](https://hashnode.com/@talha24ramzan)

[Sep 17](https://hashnode.com/posts/open-source-agentmail-alternative-cloudflare-workers/6aa678994022e77333d11b8d/comment/6aab97b112258031443d2bcf)

"An address nobody has created is treated differently", the ALLOW\_UNKNOWN\_INBOX flag is the one config choice I'd actually lose sleep over here. Leave it open on a catch-all and you've built an infinite free inbox generator for anyone who knows your domain, not just your own agents.