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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.

About

SubsiMail is a self-hosted cold email sequencing platform. Prospect lists, templates, connected inboxes, and all campaign data live in your own database, not a third-party SaaS. It's built as a self-hosted alternative to Instantly, Smartlead, lemlist, and Apollo, with flat per-inbox pricing instead of per-seat fees, full data ownership and export, no content review, and no third-party access to your contacts or campaigns. Runs as a single Docker container on any $5 VPS. Connect Gmail, Outlook, or any SMTP/IMAP inbox; build multi-step sequences with merge fields and reply detection; manage per-user roles (admin/manager/view-only) with a full audit trail; and integrate via a REST API with personal API keys. The first connected mailbox is free forever.

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 Supported
Cloud Not Supported
On-Premises Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

AI agent builders that need an email API for AI agents

Audience

Sales teams, agencies, recruiters, and solo founders running cold email outreach who want to own their data instead of trusting a third-party SaaS with their prospect lists.

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported

Support

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

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

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

Pricing

Free (paid plans from $49/mo)
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 Supported
In Person Supported

Training

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

Company Information

Sendmux
Founded: 2026
Australia
sendmux.ai

Company Information

SubsiMail
Founded: 2026
India
subsimail.com

Alternatives

EmailLabs

EmailLabs

Vercom

Alternatives

SendHQ

SendHQ

Vynara Technologies
SendPost

SendPost

SendWorks

Categories

Agentic AI Supported
Email APIs Supported

Categories

Cold Email Supported
Email Marketing Supported

Integrations

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

Integrations

Gmail Supported
Microsoft Outlook Supported
Claude Not Supported
Codex CLI Not Supported
FetchSandbox Not Supported
LangChain Not Supported
Model Context Protocol (MCP) Not Supported
Python Not Supported
Ruby Not Supported
Slack Not Supported
Vercel AI SDK Not Supported
Zapier Not Supported
n8n Not Supported
Claim Sendmux and update features and information
Claim Sendmux and update features and information
Claim SubsiMail and update features and information
Claim SubsiMail and update features and information