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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 SendPost?

SendPost streamlines the process by eliminating the manual hacks, convoluted workarounds, and everyday annoyances that typically come with using your email API or SMTP provider. While most email API solutions function effectively for those sending a few thousand emails, the choice often hinges on factors such as cost, features, or customer support. However, for high-volume senders dispatching millions of emails monthly, the real challenge lies in managing numerous domains, IP pools, and maintaining IP/domain reputation, which can become quite troublesome. A minor decline in your email open rates or delivery success can drastically affect your revenue stream, making it crucial to have a reliable solution at hand. You require a system that not only helps you pinpoint issues but also offers swift solutions, allowing you to avoid wasting hours sifting through logs to assess the health of your domain, IP, or sending reputation. With SendPost, you can focus on your core business while ensuring your email deliverability remains optimal.

Media

Media

Integrations Supported

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

Integrations Supported

E-Warmup
Warmup Inbox

API Availability

Has API

API Availability

Has API

Pricing Information

$0.15 per 1000 emails
Free Version

Pricing Information

$7 per month

Supported Platforms

SaaS

Supported Platforms

SaaS

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
Online Training

Company Facts

Organization Name

Sendmux

Date Founded

2026

Company Location

Australia

Company Website

sendmux.ai

Company Facts

Organization Name

SendWorks

Date Founded

2016

Company Location

United States

Company Website

sendpost.io

Categories and Features

Agentic AI

Not specified

Email APIs

Not specified

Categories and Features

Email APIs

Not specified

Email Deliverability

Not specified

SMTP

Not specified

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