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What is Sendmux?

Sendmux offers specialized inboxes for AI agents along with an efficient framework for email communication. Each agent can handle incoming messages, assess conversation threads, organize attachments, respond to emails, and interact with new mail via signed webhooks or Server-Sent Events. Teams have the option to send emails using various methods, including Gmail OAuth, Outlook OAuth, SMTP services, or managed Amazon SES, providing them with flexibility in their email operations. Furthermore, Sendmux allows for the distribution of email sending across multiple providers through features like weighted routing, sender-domain routing, health checks, failover strategies, and customizable quotas that can be set for different timeframes such as seconds, minutes, hours, or days. Developers benefit from a suite of tools including Mailbox, Sending, and Management APIs, extensive OpenAPI documentation, SDKs, the sendmux CLI, and MCP utilities, along with Sendmux Skills. Additionally, the system guarantees tenant isolation, offers mailbox-specific API keys, accommodates custom domains, and features robust logging and metrics, all while adhering to a usage-based pricing structure that avoids charging per seat or mailbox. This thorough design not only streamlines email management for teams and developers but also enhances their overall communication efficiency. By prioritizing flexibility and functionality, Sendmux positions itself as a pivotal tool in the landscape of email communication solutions.

What is SMTP.com?

Dependable SMTP relay and email delivery services are essential for managing your communications. With robust email delivery solutions, you can effortlessly send and monitor significant quantities of emails. In a matter of minutes, you can integrate these services and commence sending your emails. All aspects of your email delivery, including transactional and relay requirements, are managed in one convenient location. SMTP has the capability to provide a trustworthy backend solution or a flexible infrastructure that accommodates large email volumes. The proprietary technology known as Reputation Defender utilizes extensive data analysis to proactively safeguard and enhance the health of your email list. It also filters out problematic emails, including both soft and hard bounces, thereby preserving your IP reputation and domain integrity. This proactive approach ensures that your email delivery rates and placement in recipients' inboxes steadily improve over time. As a result, you can expect not only enhanced deliverability but also greater engagement from your audience.

Media

Media

Integrations Supported

Gmail
Slack
Claude
FetchSandbox
LangChain
Microsoft Outlook
Model Context Protocol (MCP)
Python
Vercel AI SDK
n8n

Integrations Supported

Gmail
Slack
Airtable
Gammadyne Mailer
Google Calendar
Google Docs
Google Forms
IntelliClick
Montra
Trello
WordPress
Wufoo

API Availability

Has API

API Availability

Has API

Pricing Information

$0.15 per 1000 emails
Free Version

Pricing Information

$25 per month
$25 for 50,000 emails / mo
$80 for 100,000 emails / mo
$300 for 500,000 emails / mo
$500 for 1,000,000 emails / mo

24hr support with all plans!

Supported Platforms

SaaS

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training

Company Facts

Organization Name

Sendmux

Date Founded

2026

Company Location

Australia

Company Website

sendmux.ai

Company Facts

Organization Name

Ziff Davis

Date Founded

1995

Company Location

United States

Company Website

www.smtp.com

Categories and Features

Agentic AI

Not specified

Email APIs

Not specified

Categories and Features

Email APIs

Not specified

Email Deliverability

DMARC Analytics
Deliverability Alerts
Deliverability Reporting
Email Address Verification
Email Content Testing
Email Previewing
IP Blacklist Monitoring
Inbox Placement Testing
Reputation Reporting

Email Verification

Bulk Email Verification
Catch-all Server Detection
Disposable Email Detection
Domain Check
Mail Server Validation
Single Email Verification
Spam Trap Detection
Syntax Check

SMTP

Not specified

Transactional Email

A/B Testing
Contact Database
Dynamic Content
Email Monitoring
Mailing List Management
Reporting/Analytics
Spam Check
Template Management

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