Sendmux is one workspace and API to send, receive, route, and monitor email, built for products and AI agents. Most email platforms stop at sending. Sendmux gives your app or agent a real inbox that can send mail, receive it, hold it, reply, and search across threads, all from the same place. Where it stands apart is how it treats AI agents. An agent can self-register for its own constrained mailbox and then invite you to approve it. Until you say yes, it can read and receive but cannot send a single message. Human approval is the default, not an add-on, so you can hand an agent its own email address without handing over your sending reputation. Under the hood you get transactional sending for single or batch email, real mailboxes on your own verified domain or the shared myagent.mx domain, and full inbox access to read, triage, reply, and sync messages. Delivery logs and metrics are searchable and exportable to CSV, webhooks are signed for delivery and inbound events, and API keys are scoped separately for sending, mailbox, and management. You connect however you work: hosted MCP with OAuth, a CLI, or SDKs for Python, Go, Ruby, PHP, and TypeScript. Each team starts with 50 mailboxes. It fits developers who want transactional sending plus a programmable inbox in one API, and teams building AI agents that need to send and receive email safely. Give an agent its own inbox, keep a human in the loop on every send, and see exactly what went out. That's Sendmux.
Read morePricing
SW Score Breakdown
Platforms Supported
Organization Types Supported
API Support
Modes of Support
Custom Domain Support
Allow business email with branded domains.Undo Send
Allows to recall or retrieve mistakenly sent emailsSpam and Malware Filtering
Protect against phishing, spam, and harmful files.Two-factor Authentication
Enhance admin login security with Two-Factor Authentication (2FA) using SMS codes, biometrics, or physical tokens to prevent unauthorized access.SSL TSL Certificate
Enable HTTPS and secure communicationCross Device Access
Access seamlessly across desktop, mobile, tablet, kiosks, and apps.Email Automation
Automates the emailing process by sending out targeted messages to clients based on time and specific actions.Storage Management
Systematically stores and organizes all your documents that drastically reduce the risk of lost or misplaced filesLabeling
Supports adding labels to certain items for its quick and easy identificationPre-built Templates
Has inbuilt templates for landing pages so that designing from the scratch is not requiredEmail Suppression
Stores the email addresses that are unsubscribed, bounced, blacklisted, etcCustom Spam Filter
Allows you to block all inbound messages that have a spam score higher than the set threshold.Email Tag
Allows the user to tag a specific set of emails for better reportingCustom Reverse DNS
Allows you to Whitelabel the dedicated IP address to the ISPEmail History
Provides historical data about the email sent for a particular time periodAutomated IP Warmup
Automatically warmups the dedicated IP addresses by limiting the number of emails sentCustom Metadata
Assign customized identifiers to track and retrieve the instances for their entire lifecycleReal-time Reporting
Allows users to check campaign real-time status as it happensEmail Personalization
Send emails with dynamic subject lines and personalized content to a different audienceWebhooks
Provides notifications about email delivery issues, deliveries, opens, clicks, unsubscribes etcSMTP
Provides SMTP relay for faster deliveryPredesigned Email Templates
Provides a library of templates to build an emailMulti-factor Authentication (MFA)
Uses more than one method to verify a user's identity for a loginDelivery by Time Zone
Subscribers receive the email at the exact time they are in their timezone.Send Time Optimization
Helps to find the best sending time to engage with your customerSign Up Forms
Build sign up forms to allow website visitors to join your mailing listRSS to Email
Helps users to receive any new updates or the latest news from the websitePredesigned Email Templates
Provides a library of templates to build an emailEmail Scheduling
Scheduling an email on a specific time or auto-responding to an actionReal-time Email Editor
Helps to view the email while editing at the same timeEvent Triggered Email
Sends emails to targeted customers based on their activitiesAuto-Responders
Ability to send automated emails to the contacts subscribing to the list.Instagram Ads
Has an inbuilt tool to set up an Instagram marketing campaignFacebook Ads
Has an inbuilt tool to set up a Facebook marketing campaignGoogle Remarketing Ads
Allows for retargeting your customers via Google Display Network to increase conversionsAbandoned Cart Email
Sends email to customers who have failed to check out their cart itemsMobile App
Helps your team to stay top on the business everywhereFree Stock Photos
Provides a library of free stock photos for commercial useContact List Import
Ability to import contacts from TXT, EXCEL, CSV formats and also can enter manuallyClick Map
Allows tracking user click activity and how they interact with emailDocument Library
Central repository to manage your assets like Images, PDF files, etc.,List Segmentation
Segregates the customers into smaller groups enabling the user to send targeted emailsDrag and Drop Editor
Lets you customize the elements with images, web forms, boxes, tables, etc. by simple drag and drop interface98% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
Featured98% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
97% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
92% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
91% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
87% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
84% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
79% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
79% SW Score The SW Score ranks the products within a particular category on a variety of parameters, to provide a definite ranking system. Read more
What is Sendmux?
Can Sendmux receive email, or does it only send?
Is it safe to give an AI agent its own email address?
How is Sendmux different from a send-only transactional email API?
How do I connect it, and do I need my own domain?
myagent.mx domain to send your first test in about two minutes.What is Sendmux used for?
Sendmux is Email Software. Sendmux offers the following functionalities:
Learn more about Sendmux features.
What are the top alternatives for Sendmux?
Here`s a list of the best alternatives for Sendmux:
Vendor Details
Founded : 2026Contact Details
Not available
https://sendmux.ai
Social Media Handles
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