Related Products
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About
A mass email service inside of Gmail. Get the highest open rates you've ever seen. Send cold emails with sequences that maximize responses. Send mail merge campaigns with automatic follow-ups. Pull from Google Sheets, not CSV files. Send emails as replies to the last thread with each person. Personalize. Schedule. Track opens, clicks, replies. Validate your list with our built-in verifier to maximize the deliverability. Say goodbye to CSV files. Connect to Google Sheets to send a personalized mass email using any of the columns in your spreadsheet. Use Gmail's powerful search feature to find messages containing recipients to whom you want to email. Then click the Build Email List button, and a Compose window will load containing the email addresses found in those messages. The only mass email service that does this! The easiest way to send cold email sequences in Gmail.
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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.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Professionals interested in a cold/mass email service inside of Gmail
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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.
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and Videos |
Screenshots and VideosNo images available
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Pricing
$12.95 per month
Price is per Gmail or G Suite account
Free Version
Free Trial
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Pricing
Free (paid plans from $49/mo)
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationGMass
Founded: 2015
United States
gmass.co
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Company InformationSubsiMail
Founded: 2026
India
subsimail.com
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Alternatives |
Alternatives |
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Categories |
Categories |
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Email Tracking Features
A/B Testing
Audience Segmentation
Campaign Management
Event-Based Notifications
Location Tracking
Team Management
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Integrations
Gmail
Google Chrome
Google Sheets
Google Workspace
Hyperise
Microsoft 365
Microsoft Outlook
Microsoft Word
Pitchsail
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Integrations
Gmail
Google Chrome
Google Sheets
Google Workspace
Hyperise
Microsoft 365
Microsoft Outlook
Microsoft Word
Pitchsail
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