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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 MyColdInbox?

MyColdInbox is an innovative email management platform that facilitates team collaboration by enabling efficient handling of replies to cold outreach from multiple sending accounts. It offers seamless integration with Gmail, Google Workspace, Outlook, Microsoft 365, and various IMAP/SMTP email services, bringing all incoming communications into a unified workspace while maintaining the connection to their original mailboxes. Users can conveniently filter and search conversations, label responses, assign tasks to team members, add internal notes, and respond directly through the original sending account. The platform is particularly beneficial for agencies managing client inboxes and teams engaged in sales development, lead generation, recruitment, and outreach initiatives led by founders, thanks to its role-specific workspaces. In contrast to standard email campaign tools, MyColdInbox focuses on managing replies while allowing teams to retain their preferred campaign software. Furthermore, it includes features for tracking thread statuses and customizable visibility settings for both shared and personal inboxes, significantly improving team collaboration and operational efficiency. By using MyColdInbox, teams can effectively ensure that every reply is addressed, which ultimately enhances their communication strategies and follow-up processes. This results in a more organized approach to email management, helping teams to streamline their outreach efforts and achieve better outcomes.

Media

Media

No images available

Integrations Supported

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

Integrations Supported

Gmail
Microsoft Outlook
Brevo
Google Workspace
Microsoft 365
SendGrid
Yahoo! Mail
Zoho Mail

API Availability

Has API

API Availability

Pricing Information

$0.15 per 1000 emails
Free Version

Pricing Information

$15/user/month
Basic is $15 per seat per month; Pro is $29 and Business is $45 per seat per month. Paid plans receive 20% off with yearly billing. The 14-day free trial includes up to two mailboxes and requires no credit card. Basic allows up to 10 mailboxes; Pro and Business have no mailbox limit. Plans do not charge per mailbox.
Free Trial Offered?

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

Clustox LLC

Date Founded

2012

Company Location

United States

Company Website

mycoldinbox.com

Categories and Features

Agentic AI

Not specified

Email APIs

Not specified

Categories and Features

Email Management

Not specified

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