MyColdInbox

MyColdInbox

Clustox LLC
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About

MyColdInbox is a web-based shared inbox and email management platform for teams handling cold-outreach replies across multiple sending accounts. It connects Gmail and Google Workspace, Outlook and Microsoft 365, and compatible IMAP/SMTP mailboxes, bringing incoming messages into a unified workspace with each message linked to its source mailbox. Teams can filter and search conversations, label replies, assign threads to teammates, add internal notes, and reply from the original sending account. Role-based workspaces support agencies managing client inboxes, as well as sales development, lead-generation, recruiting, and founder-led outreach teams. MyColdInbox manages replies rather than sending campaigns, allowing teams to keep using their existing campaign tools. It also includes thread status tracking and shared or personal inbox visibility settings.

About

Sendmux gives AI agents their own inbox and a controlled way to send email. Each agent can receive messages, read threads, handle attachments, send replies, and react to new mail through signed webhooks or Server-Sent Events. Teams can send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Sendmux can spread sending across providers with weighted routing, sender-domain routing, health checks, failover, and quotas by second, minute, hour, or day. Developers get Mailbox, Sending, and Management APIs, OpenAPI docs, SDKs, the sendmux CLI, MCP tools, and Sendmux Skills. The platform also covers tenant isolation, mailbox-scoped API keys, custom domains, logs, metrics, and usage-based pricing with no per-seat or per-mailbox fees.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Lead generation agencies, SDR and sales teams, founders and recruiters running cold email from many inboxes

Audience

AI agent builders that need an email API for AI agents

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$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 Version Not Supported
Free Trial Supported

Pricing

$0.15 per 1000 emails
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Supported
In Person Supported

Company Information

Clustox LLC
Founded: 2012
United States
mycoldinbox.com

Company Information

Sendmux
Founded: 2026
Australia
sendmux.ai

Alternatives

Alternatives

GenMail

GenMail

Genspark
EmailLabs

EmailLabs

Vercom
emailcampaign.ai

emailcampaign.ai

Email Campaign LLC

Categories

Email Management Supported

Categories

Agentic AI Supported
Email APIs Supported

Integrations

Gmail Supported
Microsoft Outlook Supported
Amazon SES Supported
Brevo Supported
Claude Duet Not Supported
Claude for Legal Not Supported
Codex CLI Not Supported
FetchSandbox Not Supported
GoDaddy Email Supported
LangChain Not Supported
Mailgun Supported
Microsoft 365 Supported
Python Not Supported
Ruby Not Supported
SendGrid Supported
Slack Not Supported
Yahoo! Mail Supported
Zapier Not Supported
Zoho Mail Supported
n8n Not Supported

Integrations

Gmail Supported
Microsoft Outlook Supported
Amazon SES Not Supported
Brevo Not Supported
Claude Duet Supported
Claude for Legal Supported
Codex CLI Supported
FetchSandbox Supported
GoDaddy Email Not Supported
LangChain Supported
Mailgun Not Supported
Microsoft 365 Not Supported
Python Supported
Ruby Supported
SendGrid Not Supported
Slack Supported
Yahoo! Mail Not Supported
Zapier Supported
Zoho Mail Not Supported
n8n Supported
Claim MyColdInbox and update features and information
Claim MyColdInbox and update features and information
Claim Sendmux and update features and information
Claim Sendmux and update features and information