Sendmux
Sendmux is an email inbox API and sending platform for AI agents. It gives every agent a real email identity: a dedicated mailbox that can receive inbound email, read threads, process attachments, use cleaned message content, send replies, and react to new messages through signed webhooks or Server-Sent Events. **For outbound email**, Sendmux lets teams send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Delivery groups support weighted routing, sender-domain routing, provider health checks, automatic failover, and per-provider quotas from per second to per day. That makes it useful for agent products, automation teams, support workflows, ops agents, platform builders, and BYO-provider cold email setups that need controlled sending from AI tools. **For inbound email**, Sendmux mailboxes support custom domains with SPF, DKIM, and DMARC, mailbox-scoped API keys, sender filters, folders, labels, attachments, raw .eml downloads, IMAP retrieval, and SMTP.
Screenshots
About Sendmux
Sendmux is an email inbox API and sending platform for AI agents. It gives every agent a real email identity: a dedicated mailbox that can receive inbound email, read threads, process attachments, use cleaned message content, send replies, and react to new messages through signed webhooks or Server-Sent Events.
For outbound email, Sendmux lets teams send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Delivery groups support weighted routing, sender-domain routing, provider health checks, automatic failover, and per-provider quotas from per second to per day. That makes it useful for agent products, automation teams, support workflows, ops agents, platform builders, and BYO-provider cold email setups that need controlled sending from AI tools.
For inbound email, Sendmux mailboxes support custom domains with SPF, DKIM, and DMARC, mailbox-scoped API keys, sender filters, folders, labels, attachments, raw .eml downloads, IMAP retrieval, and SMTP.
Key Features:
- Email inbox API for AI agents
- Dedicated agent mailboxes
- Multi-provider email sending
- Managed Amazon SES sending
- Per-provider quotas and throttling
- Weighted routing and failover
- Signed webhooks and SSE events
- Mailbox API for threads and attachments
- MCP, SDKs, CLI, and Sendmux Skills
- Usage-based pricing with no mailbox fees
Main Use Cases:
- AI customer support agents with real inboxes
- Sales and outreach agents using customer-owned providers
- Scheduling and executive-assistant agents
- Research and monitoring agents that process email updates
- Ops, finance, and vendor workflow agents
- Multi-tenant SaaS platforms needing isolated mailboxes
- Automation agencies managing client email workflows
- Internal tools that need webhook-driven email automation
Use Cases
Key Features:
- Email inbox API for AI agents
- Dedicated agent mailboxes
- Multi-provider email sending
- Managed Amazon SES sending
- Per-provider quotas and throttling
- Weighted routing and failover
- Signed webhooks and SSE events
- Mailbox API for threads and attachments
- MCP, SDKs, CLI, and Sendmux Skills
- Usage-based pricing with no mailbox fees
Main Use Cases:
- AI customer support agents with real inboxes
- Sales and outreach agents using customer-owned providers
- Scheduling and executive-assistant agents
- Research and monitoring agents that process email updates
- Ops, finance, and vendor workflow agents
- Multi-tenant SaaS platforms needing isolated mailboxes
- Automation agencies managing client email workflows
- Internal tools that need webhook-driven email automation
Similar Tools
View all →Outreach.io
"Outreach.io is a sales engagement platform designed to help sales teams boost productivity through enhanced communication, automation, and analytics"
Clari
"Clari is a unified platform designed to manage and accelerate revenue processes, aiming to consolidate spend, simplify tech usage, and enhance results by offering features to create, convert, and close revenue opportunities"
Phrasee
"Phrasee is a platform that delivers AI-generated, on-brand content with enterprise-grade controls and optimization at scale, aiming to boost clicks, conversions, and customer engagement"
Uplead
"UpLead is a B2B prospecting platform designed to provide accurate contact data to help businesses grow their sales pipeline and accelerate revenue growth"
Drift
"Drift is an AI-powered buyer engagement platform that automatically listens, understands, and learns from buyers to create highly personalized experiences."
Veloxy
"Veloxy is a Sales AI platform designed for Salesforce users, offering various tools to enhance sales engagements and productivity through features like email marketing, sales automation, and analytics."
Trenz.ai
In today’s fast-changing digital world, success belongs to those who move quickly and make decisions based on data. Trenz.ai is a powerful social commerce marketing platform designed for TikTok Shop sellers and brands aiming for greater influence. It utilizes advanced data and AI to provide a comprehensive understanding of the market, competitors, and customers, identifying trends before they become obvious and transforming data into actionable strategies.
AroundDeal
"Find B2B contact info & auto-convert jd to shortlist within seconds. AI recruiting and prospecting. ChatGPT-powered. Try for Free!\nYour AI talent and B2B contact finder powered by ChatGPT 🔥\nAI-analyze job requirements. AI-recommend best talents. AI talent sourcing. Find 120M+ prospects contacts. Access all LinkedIn Members even if they are outside your connections. Usable on LinkedIn, company website, CRMs and everywhere online. \n\n⭐️ It works for recruiters, sales reps, and all business professionals, helping you simplify your recruiting and prospecting process, access contacts faster and easier, and enhance your revenue right away.\n\n👩🏻💼 For recruiters | Features highlight: \n💡 AI sourcing on LinkedIn Jobs Page: Click AroundDeal embedded button on Jobs pages, get automated talent recommendations within seconds. \n💡 AI sourcing from JD to talents: Add your job requirements and receive instant targeted recommendations. \n\n👨🏻💼For sales & all business professionals | Features highlight: \n💡 Find Emails on LinkedIn: Find Any Emails of Your Targeted Prospects.\n💡 Expand LinkedIn Networks: Connect with Profiles Beyond Your LinkedIn Network.\n💡 Auto-Connect: Auto-Fill in Email Addresses When LinkedIn Requires One to Connect."
Seamless AI
"Seamless.AI is a real-time search engine that helps B2B companies find accurate sales leads so they can get in front of the right prospects, close more deals, and grow revenue at scale."
Styldod
"[Styldod](https://www.styldod.com/) is a design-tech company that reimagines and automates the listing photography process, helping real estate agents present homes in their best light online"