ColdStackColdStack.co
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Related Products
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About
Stop losing deals in the 2-hour window between lead reply and your response. ColdStack brings every cold email reply from Instantly, Smartlead, and EmailBison into a single Slack channel where your team can see and act instantly.
Each reply triggers a real-time notification with full engagement context—who opened what, when, and how many times. Your team replies directly from Slack, and ColdStack syncs everything back bidirectionally to your source platform. No more toggling between dashboards, Gmail, and Slack.
Built for cold email agencies and sales teams who live in Slack. Mobile-ready through Slack's app.
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About
Mailreef is a cold email mailbox infrastructure platform built by cold emailers to make delivery and scaling easy. Its mailboxes are designed to rival Google, Zoho, and Outlook while giving outreach teams a cold-email-friendly environment with dedicated mail servers, dedicated IP addresses, bring-your-own-domain support, and unlimited inboxes. It lets users create domains and mailboxes in one click, with SPF, DKIM, and DMARC automatically configured so teams do not have to manage DNS records manually. Mailreef is built for teams that need to scale cold email campaigns without wasting time creating accounts, setting up fake profiles, or dealing with mailbox blocks from traditional providers. Its infrastructure supports day-one campaign readiness through pre-warmed servers, pre-warmed domains, and pre-warmed mailboxes, helping teams start outreach faster while maintaining stronger deliverability foundations.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
B2B companies
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Audience
Cold emailers, agencies and outbound teams looking to manage dedicated email infrastructure and improve campaign deliverability at scale
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
No information available.
Free Version
Not Supported
Free Trial
Not Supported
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Pricing
$240 per month
Free Version
Not Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Not Supported
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Company InformationColdStack.co
Founded: 2025
United States
www.coldstack.so/
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Company InformationMailreef
Founded: 2022
United States
www.mailreef.com
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Categories |
Categories |
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Integrations
Gmail
Supported
Google Workspace
Not Supported
Instantly
Not Supported
Microsoft Outlook
Not Supported
Slack
Supported
Smartlead.ai
Not Supported
Zoho Mail
Not Supported
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Integrations
Gmail
Supported
Google Workspace
Supported
Instantly
Supported
Microsoft Outlook
Supported
Slack
Not Supported
Smartlead.ai
Supported
Zoho Mail
Supported
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