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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

A-Leads
AQtive Guard
Axis LMS
ElectroNeek
Findymail
FirstQuadrant
Freckle
Gojiberry AI
Habsy
InboxFlow
Integry
Knolli
LinkedNav
Maildoso
Mailreef
Motileo
RB2B
Tadata
TweetScraper
XemailAudit

API Availability

API Availability

Pricing Information

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

Pricing Information

$30 per month
Free Trial Offered?

Supported Platforms

On-Prem
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

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

Cold Email

Not specified

Email Marketing

Not specified

Categories and Features

AI SDR

Not specified

Cold Email

Not specified

Email Marketing

Not specified

Email Warmup

Not specified

Lead Intelligence

Not specified

Sales Engagement

Not specified

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