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What is SubsiMail?

SubsiMail is a self-hosted platform for cold email sequencing that enables users to oversee their prospect lists, templates, connected inboxes, and all campaign-related information within their own database, eliminating the need for third-party SaaS solutions. Positioned as a viable alternative to services like Instantly, Smartlead, lemlist, and Apollo, it features straightforward pricing based on the number of connected inboxes, rather than charging per seat, thus ensuring users retain full ownership of their data and can export it freely without undergoing any content review processes or external interference with their contacts and campaigns. The application runs efficiently as a single Docker container on an affordable $5 VPS, allowing connections to Gmail, Outlook, or any SMTP/IMAP inbox, enabling the creation of multi-step email sequences that can utilize merge fields and reply detection, while also providing user role management (admin, manager, view-only) with a detailed audit trail. Additionally, integration is facilitated through a REST API that is secured by personal API keys, enhancing the security of user data. Notably, the first connected mailbox is offered with a perpetually free option, making it particularly appealing to both individuals and companies. This innovative configuration not only grants users superior control over their email marketing initiatives but also streamlines the overall management experience, ensuring a more efficient workflow. As a result, SubsiMail stands out as a powerful tool for anyone looking to optimize their email outreach efforts.

What is ColdStack?

Don’t let valuable opportunities pass you by during the critical two-hour window between a lead's reply and your response. ColdStack aggregates all cold email replies from services such as Instantly, Smartlead, and EmailBison into a singular, dedicated Slack channel, enabling your team to respond swiftly and efficiently. With each reply, you'll receive immediate notifications that include detailed engagement metrics, such as who opened the email, when it was viewed, and how often it was accessed. This allows your team to seamlessly reply directly within Slack, while ColdStack guarantees that all conversations are synchronized with your original platforms, removing the need to toggle between multiple dashboards and email clients. Tailored for cold email agencies and sales teams using Slack, ColdStack also provides mobile access through Slack's app, ensuring that your team can maintain communication effortlessly while on the move. By streamlining your workflow and boosting your response rates, ColdStack helps you capture every potential lead, making it an essential tool for enhancing productivity in your sales process. Ultimately, this integration helps to create a more cohesive and effective team dynamic.

Media

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Media

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Integrations Supported

Gmail
Microsoft Outlook

Integrations Supported

Gmail
Slack

API Availability

API Availability

Pricing Information

Free (paid plans from $49/mo)
Free Version

Pricing Information

Pricing not provided

Supported Platforms

On-Prem
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Not specified

Company Facts

Organization Name

SubsiMail

Date Founded

2026

Company Location

India

Company Website

subsimail.com

Company Facts

Organization Name

ColdStack.co

Date Founded

2025

Company Location

United States

Company Website

www.coldstack.so/

Categories and Features

Cold Email

Not specified

Email Marketing

Not specified

Categories and Features

Cold Email

Not specified

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