AgentMail (YC S25)
 @agentmail

Email Inboxes for AI Agents

 San Francisco
agentmail.to
Joined February 2025
HackHalloween is in 10 days. We are thrilled to welcome @composiohq + @usemoss as sponsors, in addition to @OpenAI joining for prize and credit support. Giving away over $100k in cash + credits! Please sign up ASAP to reserve your spot using the link in the comments.
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If there's one thing you could wish for, what would it be? 11/11
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AgentMail (YC S25) retweeted
Emir
 @emirthedev
Nov 5
i am starting a new mini design movement with ascii art - hero section for agentmail
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AgentMail (YC S25) retweeted
conor brennan-burke
 @conor_ai
Nov 5
wild seeing everything teams built on @hyperspell at hackhalloween 🎃 shoutout @agentmail for hosting + @composio for the recap
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200 hackers. 24 hours. $100K+ in prizes. The first HackHalloween was pure chaos ⚡️🎃 Builders pushed agents past their limits and built demos that felt like startups of future. Huge thanks to all the hackers who came, and the sponsors who supported. See you next halloween :)
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AgentMail (YC S25) retweeted
Heath Sun @Heath_Sun
Nov 1
A robber at AgentMail YC HackHalloween @agentmail @ycombinator #Halloween
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AgentMail (YC S25) retweeted
Manu Ebert
 @maebert
Nov 1
Rocking the scariest costume at the @hyperspell X @agentmail Halloween hackathon #aws
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AgentMail (YC S25) retweeted
Natalie
 @livinoffwater
Nov 1
Spending my first Halloween in the states building at @agentmail Halloween hackathon
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AgentMail (YC S25) retweeted
Composio
 @composio
Nov 3
Probably one of the coolest hackathons we were a part of 🎃 This is @agentmail's HackHalloween at @ycombinator 👻
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AgentMail (YC S25) retweeted
Natalie
 @livinoffwater
Nov 3
2/ Also thanks @agentmail hosting & @livekit @convex_dev sponsoring Our architecture is modular by design: devs pick preferred service providers (TTS/STT, memory, inbox etc) and deploy plug-in mini-apps that run directly on ESP32 or Nordic. No rewrites just drop-in capabilities
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just the beginning
Owen Tao
 @theowentao
Nov 3
The AgentMail Hack Halloween wrapped up just 3 days ago, and it was pure chaos in the best way possible. Founders, builders, and agents pushed boundaries for 24 hours straight, turning wild ideas into working prototypes. From eerie automation to spooky-smart agents, the creativity was unreal. The energy’s still buzzing, and this is just the beginning.
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Alex is the goat!!!
Alex Aridgides
 @AlexAridgides
Nov 2
OMG I JUST WON THE AGENTMAIL YC HACKATHON!! Literally can’t think right now Very special thanks to the sponsors for letting me try and hack your websites (most of them were a-ok)
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AgentMail (YC S25) retweeted
Alex Aridgides
 @AlexAridgides
Nov 2
OMG I JUST WON THE AGENTMAIL YC HACKATHON!! Literally can’t think right now Very special thanks to the sponsors for letting me try and hack your websites (most of them were a-ok)
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That wraps up the Hack Halloween Costume Competition 🕸️ Coming up, the overall Hack Halloween winners… 🎃
🥉 3rd Place — @MatheSharvadze as The Last TS Bender TypeScript bending meets hacker energy. Balance restored.
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🥈 2nd Place —@soleil_colza_ as No-Face (Kaonashi) from Spirited Away Budget: $10 , Execution: flawless, spirit of hacking: limitless.
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🥇 1st Place — @JahnaviBhansal1 as Clippy “Clippy walked so AI workflow automation startups could run.” Truly the father of all agents.
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We are giving away $1000 to the best costume at HackHalloween 👇
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AgentMail (YC S25) retweeted
Adi Singh
 @adisingh
Nov 1
POV: it's 2am on Halloween night in SF
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Good morning from Day 2. Most teams kept building through the night. Caffeine is flowing and projects are taking shape. Let’s see what ships today!
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It’s almost midnight and the room is still packed. Teams are deep in their builds, debugging agents and running on caffeine and Halloween candy. No one’s slowing down. Happy Halloween 👻
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