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.
About SubsiMail
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.
Other Popular Alternatives & Related Software
Ballast
Ballast is a cold email platform for teams running one-to-one outbound campaigns from their own mailboxes. Users can connect Google Workspace, Gmail, Microsoft 365, or other SMTP/IMAP accounts; import leads; build multistep sequences with personalization and variants; and manage replies in a shared inbox. The platform includes mailbox warmup, sending schedules, domain checks, inbox-placement tests, bounce thresholds that can pause sending, and campaign analytics. Plans are priced by monthly email volume and include unlimited mailboxes and seats, API access, webhooks, and MCP tools. Teams can connect AI models for reply classification and drafting, configure Slack reply alerts, or automate workflows through n8n. CSV presets support lead imports from Apollo, Clay, Instantly, Smartlead, and Lemlist.
Learn more about Ballast
Terlido
Terlido is a cloud-based platform for teams running cold-email campaigns from connected Gmail, Microsoft 365, or SMTP/IMAP mailboxes. Warmup and campaigns share one daily per-mailbox send budget, with recipient-domain throttling, suppression controls, and automatic pauses at bounce or spam thresholds. Before sending, it checks SPF, DKIM, DMARC, and MX records; unsubscribe headers remain on. Sequences combine email, WhatsApp, LinkedIn, and call steps. LinkedIn steps become prepared tasks for a person, not automated account actions. Terlido Newsletter is free for up to 10,000 subscribers. The platform also offers a unified inbox, contact management, campaign analytics, two-way HubSpot sync, and a REST API and MCP server on eligible plans; agent use follows sending limits and workspace controls. Teams can manage outreach campaigns and replies from one workspace.
Learn more about Terlido
InboxKit
InboxKit is the leading cold email infrastructure platform that automates domain and mailbox provisioning at scale. We help cold email agencies, sales teams, and outbound consultancies set up Google Workspace and Microsoft 365 mailboxes in minutes, not hours. Key features include automated DNS configuration, one-click export to 15+ sequencers (Instantly, SmartLead, Lemlist, Reply.io, etc.), real-time deliverability monitoring, and bulk mailbox management. As an official Google Cloud Partner and Microsoft Partner, we provide enterprise-grade infrastructure without the manual setup overhead.
Learn more about InboxKit
lemlist
Personalize cold emails, automate follow-ups, and engage with leads across all channels. lemlist is your sales automation and cold email software in one. From teams of 2 to 200+, lemlist solves every outreach automation challenge. Increase your reply rates by communicating with every prospect on a 1-on-1 level. Write custom intro lines and call-to-actions. Automatically put any screenshot, custom text, or company logos onto images in your emails. Add dynamic landing pages and embed videos. Launch powerful cold email sequences, send follow-ups that don't feel generic, and open more opportunities for your business. Close more deals by engaging with your leads across multiple channels on autopilot. Add cold calls and dial prospects with one click. Include custom tasks and social selling. Sync seamlessly with your team and quickly see at what stage a specific lead is in.
Learn more about lemlist
Pricing
Starting Price:
Free (paid plans from $49/mo)
Free Version:
Free Version available.
Integrations
Company Information
SubsiMail
Founded: 2026
India
subsimail.com
Videos and Screen Captures
Other Useful Business Software
$300 Free Credits to Build on Google Cloud
Put your $300 in credit toward real workloads, then keep building with free monthly usage for 20+ products. No commitment and no charge until you upgrade.
Product Details
Platforms Supported
Linux
On-Premises
Training
Documentation
Support
Online
SubsiMail Frequently Asked Questions
Q: What kinds of users and organization types does SubsiMail work with?
SubsiMail works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does SubsiMail support in their product?
SubsiMail supports these languages: English.
Q: What kind of support options does SubsiMail offer?
SubsiMail offers support via online.
Q: What other applications or services does SubsiMail integrate with?
SubsiMail integrates with: Gmail and Microsoft Outlook.
Q: What type of training does SubsiMail provide?
SubsiMail provides training in the form of documentation.
Q: How much does SubsiMail cost?
Pricing for SubsiMail starts at Free (paid plans from $49/mo).
