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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 Postmark?

Ensure your application emails are delivered consistently and punctually with ActiveCampaign Postmark. This service guarantees that your emails reach customers exactly when expected, as timely transactional emails are crucial for user satisfaction. We keep a close watch on our delivery metrics and transparently share this information with the public. In addition, our expert support team is readily accessible for assistance, whether through personalized calls, informative webinars, or email communication. Furthermore, Postmark offers seamless integration into any technical stack, thanks to its robust API libraries that cater to nearly every programming language, making it an ideal choice for developers looking to enhance their email delivery system. With this level of reliability and support, you can focus on your core business while we handle your email needs.

Media

Media

Integrations Supported

BI Book
Brew
Coconut Software
Desktop.com
Doplac CRM
Dyspatch
Ema
Formidable Victory
Integry
Leal
Mailcoach
Meltano
Nabiq
Raven
Serverless
Ship SaaS
Stripo.email
Supaboard
Swimlane
Zapier

Integrations Supported

BI Book
Brew
Coconut Software
Desktop.com
Doplac CRM
Dyspatch
Ema
Formidable Victory
Integry
Leal
Mailcoach
Meltano
Nabiq
Raven
Serverless
Ship SaaS
Stripo.email
Supaboard
Swimlane
Zapier

API Availability

Has API

API Availability

Has API

Pricing Information

$0.15 per 1000 emails
Free Trial Offered?
Free Version

Pricing Information

$10/month for 10,000 emails
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Sendmux

Date Founded

2026

Company Location

Australia

Company Website

sendmux.ai

Company Facts

Organization Name

ActiveCampaign

Date Founded

2010

Company Location

United States

Company Website

postmarkapp.com

Categories and Features

Categories and Features

Transactional Email

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

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