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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 Mailfully?

Mailfully acts as a versatile hosted transactional email API specifically designed for developers who want to send and receive messages seamlessly from their applications. This platform enables teams to dispatch various types of communications such as receipts, password resets, sign-in links, and alerts through a REST API or Node.js SDK, while also allowing for the verification of unique sending domains and the use of customizable templates that include dynamic variables. It provides detailed logs for each message that document delivery events, and its webhooks can communicate information about deliveries, bounces, complaints, opens, and clicks back to an application endpoint. Additionally, Mailfully incorporates an automatic suppression system to exclude addresses that have previously bounced or filed complaints from future email campaigns. Beyond outbound email capabilities, the service supports inbound messages via both a webhook and API, along with domain and message management through a command-line interface. Users have access to analytics that track delivery performance and can utilize an MCP server that integrates with compatible AI coding tools for sending messages and monitoring their statuses. A test mode is also included, which directs test messages to a simulator prior to live sending, ensuring a smooth user experience. The platform provides a free plan along with several paid monthly options to accommodate varying requirements. With its extensive array of features, Mailfully is an excellent choice for developers aiming to improve their email communication approaches and increase efficiency. Furthermore, the emphasis on user-friendly tools makes it accessible even for those who may be new to email API integration.

Media

Media

Integrations Supported

Model Context Protocol (MCP)
Claude
Claude Duet
Claude for Legal
Codex CLI
FetchSandbox
Gmail
LangChain
Microsoft Outlook
Python
Ruby
Slack
Vercel AI SDK
Zapier
n8n

Integrations Supported

Model Context Protocol (MCP)
Claude Code
Cursor
Grok

API Availability

Has API

API Availability

Has API

Pricing Information

$0.15 per 1000 emails
Free Version

Pricing Information

$5/month
Free plan includes 3,000 sent emails/month and 100 received emails/month at a hosted address. Starter is $5/month for 10,000 emails/month; paid-plan overage is $0.40 per 1,000 emails. Test sends do not count toward the allowance.
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub
Online Training
On-Site Training

Training Options

Documentation Hub

Company Facts

Organization Name

Sendmux

Date Founded

2026

Company Location

Australia

Company Website

sendmux.ai

Company Facts

Organization Name

Even Flow Solutions LLC

Date Founded

2025

Company Location

United States

Company Website

mailfully.com

Categories and Features

Agentic AI

Not specified

Email APIs

Not specified

Categories and Features

Email APIs

Not specified

Transactional Email

Not specified

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