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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 Instantly?

Effortlessly elevate your outreach strategy with unlimited email accounts, extensive warmup features, and advanced AI functionalities. You can ensure your lead lists are meticulously cleaned and validated while also checking that your domains are properly set up for cold emailing; our efficient one-click bulk domain tester will pinpoint any essential records that might be missing. Leverage our Campaign Builder, which integrates variables, sequences, and smart scheduling to improve both your email deliverability and response rates significantly. Rather than juggling multiple campaigns for each sending account, you have the option to merge all your accounts into a singular campaign, facilitating seamless email rotations across these accounts and creating a more natural outreach experience. With Unibox, managing a single inbox becomes effortless, allowing you to oversee dozens or even hundreds of inboxes simultaneously, categorize leads as positive or negative, forward emails, or respond directly—all from one intuitive interface designed to streamline meeting arrangements and successfully close deals. This organized methodology not only conserves your time but also significantly boosts your overall efficiency in managing outreach initiatives, making it easier to reach your goals. Ultimately, a more efficient outreach process can lead to increased engagement and improved relationships with potential clients.

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Integrations Supported

AQtive Guard
Aimfox
Axis LMS
Beam AI
CloudNuro
ColdSire
Datamorf
Findymail
Freckle
Habsy
Microsoft Outlook
Model Context Protocol (MCP)
Motileo
Response.ai
RevvedUp
Tapistro
VeriMails
Workers by Delos
Zapier
Zapmail

Integrations Supported

AQtive Guard
Aimfox
Axis LMS
Beam AI
CloudNuro
ColdSire
Datamorf
Findymail
Freckle
Habsy
Microsoft Outlook
Model Context Protocol (MCP)
Motileo
Response.ai
RevvedUp
Tapistro
VeriMails
Workers by Delos
Zapier
Zapmail

API Availability

Has API

API Availability

Has API

Pricing Information

Free (paid plans from $49/mo)
Free Version
Free Trial Offered?

Pricing Information

$30 per month
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

SubsiMail

Date Founded

2026

Company Location

India

Company Website

subsimail.com

Company Facts

Organization Name

Instantly.ai

Date Founded

2021

Company Location

Estonia

Company Website

instantly.ai/

Categories and Features

Email Marketing

A/B Testing
Artificial Intelligence
Auto-Responders
CAN SPAM Compliance
Customer Surveys
Drip Campaigns
Dynamic Content
Event Triggered Email
Image Library
Landing Pages/Web Forms
Mailing List Management
Mobile Optimized Emails
Reporting/Analytics
Subscriber Management
Template Management
WYSIWYG Email Editor

Categories and Features

Email Marketing

A/B Testing
Artificial Intelligence
Auto-Responders
CAN SPAM Compliance
Customer Surveys
Drip Campaigns
Dynamic Content
Event Triggered Email
Image Library
Landing Pages/Web Forms
Mailing List Management
Mobile Optimized Emails
Reporting/Analytics
Subscriber Management
Template Management
WYSIWYG Email Editor

Sales Engagement

CRM Integration
Call Scripts / Call Steps
Email Sequences
Email Tracking / Automation
Lead Management
Reporting / Analytics
Sales / Voice Dialer
Sales Automation
Search
Task Management
Templates
Workflow Management

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