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About

MailDeck is the market-leading enterprise cold email infrastructure platform, engineered from the ground up for high-volume senders who demand uncompromising deliverability at scale. Trusted by sales teams, growth agencies, and revenue organizations sending millions of emails per month, MailDeck provides the most reliable inbox architecture available for cold outreach. The platform seamlessly integrates Google Workspace, Microsoft 365, and a wide range of SMTP providers into a unified, enterprise-grade sending infrastructure.

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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

B2B outreach teams, SDRs, lead generation agencies, recruitment firms, fintech companies, SaaS startups, real estate agents, marketing and growth agencies, PR agencies, sales consultants, founder-led sales teams

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
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

No images available

Pricing

$99 for 30k emails/month
Free Version
Free Trial

Pricing

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

Reviews/Ratings

Overall 5.0 / 5
ease 4.5 / 5
features 4.5 / 5
design 4.5 / 5
support 5.0 / 5

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:

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Pros & Cons from Real Users

Pros

  • Correct inbox configuration, proper warmup setup, right workspace delivery, campaign limits handled properly, and genuinely technical support that solves real problems fast.
  • Very simple setup process. Prices are way lower than competitors', which matters a lot when you're buying domains in bulk. Support is responsive and always willing to help with any inquiries. Had a question about tenant configuration and got a clear answer in under 10 minutes.

Cons

  • Onboarding could use more self-serve docs, but support covers the gap well.
  • Would be great to see a built in warmup tool or deliverability dashboard added over time.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

MailDeck
Founded: 2025
United States
maildeck.co

Company Information

SubsiMail
Founded: 2026
India
subsimail.com

Alternatives

Alternatives

Categories

Categories

Integrations

Gmail
Google Workspace
Microsoft 365
Microsoft Outlook

Integrations

Gmail
Google Workspace
Microsoft 365
Microsoft Outlook
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