What is Mailreef?

Mailreef is a dedicated cold email infrastructure platform designed for agencies, revenue teams, and operators running outbound campaigns at scale. Unlike shared inbox providers, Mailreef provisions fully dedicated servers with isolated IP addresses, giving users complete control over sender reputation and deliverability. The platform eliminates manual DNS configuration by automatically setting up SPF, DKIM, and DMARC records during domain creation, while its API-first architecture enables programmatic provisioning of domains and mailboxes through Zapier or direct API calls.

Built by the founders of Warmup Inbox—one of the largest email warmup networks—Mailreef focuses on infrastructure automation rather than full-service management. The service targets technical operators who understand cold email mechanics and need a reliable foundation to support multi-domain, multi-inbox outreach strategies without the overhead of managing server configurations, DNS records, or IP allocation.

Mailreef positions itself as “infrastructure behind your cold email,” emphasizing speed of deployment, dedicated resources, and integration flexibility over white-glove consulting or managed warmup services.

Core Services

Domain Procurement & Setup

Mailreef offers 1-click domain registration integrated directly into the platform, allowing operators to spin up new sender domains without leaving the dashboard. Every domain is automatically configured with SPF, DKIM, and DMARC records upon creation, eliminating the manual DNS editing typically required for email authentication. Domains cost $19/year and are hosted on dedicated infrastructure to prevent cross-contamination from other users’ sending behavior.

Mailbox Management

The platform supports unlimited mailbox creation within server capacity limits (200 mailboxes per $249/month server). Mailboxes can be provisioned via the web dashboard, Zapier workflows, or REST API, making it possible to automate inbox creation as part of larger campaign workflows. Each mailbox is configured with proper authentication records and assigned to the server’s dedicated IP, ensuring consistent sender infrastructure across all accounts.

Dedicated IP Provisioning

Every Mailreef server includes a dedicated IP address that is not shared with other customers. This isolation gives users full control over their sender reputation—positive sending behavior builds equity on that IP, while poor practices impact only that specific environment. Pre-warmed IPs reduce the initial ramp-up period, though operators are still responsible for warming individual mailboxes through third-party tools or manual sending patterns.

DNS & Authentication Automation

Mailreef’s standout technical feature is automatic DNS configuration. When a domain or mailbox is created, the platform instantly configures SPF records to authorize the sending server, generates and installs DKIM keys for message signing, and sets DMARC policies to align authentication results. This automation removes a common operational bottleneck and reduces configuration errors that can harm deliverability.

API & Integration Layer

Mailreef provides a full REST API and native Zapier integration for programmatic infrastructure management. Agencies and high-volume operators can trigger domain registration, mailbox creation, and credential retrieval directly from their CRM, outreach platform, or custom workflow automation. This capability is critical for teams managing dozens or hundreds of domains across multiple clients or campaigns.

Monitoring & Deliverability Visibility

While Mailreef does not include active inbox warmup services, the platform provides visibility into sending quotas, domain status, and mailbox health. Users are expected to monitor deliverability metrics through their cold email sending tools (Smartlead, Instantly, etc.) or standalone monitoring platforms like MailReach or GlockApps.

Pricing & Engagement Models

Mailreef operates on a server-based subscription model with usage-based overage fees:

  • Agency Flex Plan: $249/month per server + $0.001 per email sent

    • Includes 50 domains, 200 mailboxes, and 100,000 sends/month
    • Additional domains cost $19/year
    • Sends beyond 100K billed at $0.001 each
    • Month-to-month, cancel anytime

  • Enterprise Plan: Custom pricing

    • Multiple servers, higher volume commitments
    • Contact sales for quote

Cost Example: A team sending 120,000 emails/month using 10 domains would pay:

  • $249 (base server)
  • $20 (20,000 overage sends × $0.001)
  • $190 (10 domains × $19/year ÷ 12 months)
  • Total: ~$459/month

Scaling Costs: Each server is capped at 50 domains and 200 mailboxes. Teams exceeding these limits must purchase additional servers at $249/month each, which can increase costs significantly for multi-client agencies or large-scale outbound operations.

No Setup Fees: Mailreef does not charge onboarding or migration fees, and all automation tools (API, Zapier) are included in the base subscription.

Best Fit For

Mailreef is best suited for:

  • Agencies managing multiple client campaigns who need dedicated infrastructure per client with fast provisioning and API-driven automation
  • High-volume B2B outbound teams running 50+ mailboxes across multiple domains and requiring full control over sender IPs
  • Technical operators familiar with cold email mechanics who can manage inbox warming and deliverability monitoring independently
  • Revenue teams scaling from shared providers (Google Workspace, Microsoft 365) to dedicated infrastructure without managing servers directly
  • Automation-focused operators who want to programmatically provision domains and mailboxes via Zapier or custom scripts

Mailreef is not ideal for:

  • Beginners unfamiliar with cold email infrastructure, warmup processes, or deliverability fundamentals
  • Teams expecting fully managed warmup services or white-glove deliverability consulting
  • Low-volume senders (< 20 mailboxes) for whom the $249/month base cost may not be justified
  • Operators requiring unlimited scaling without per-server capacity constraints

Onboarding & Operations

Setup Timeline: Mailreef accounts can be operational within hours. After signup, users access the dashboard to create domains and mailboxes via 1-click workflows. DNS records propagate automatically, and mailboxes are immediately available for authentication in cold email platforms like Smartlead, Instantly, or Lemlist.

Integration: Mailreef integrates with popular cold email sending tools through IMAP/SMTP credentials or API connections. The Zapier integration allows users to trigger domain/mailbox creation from external events (new client onboarding, campaign launch triggers, etc.), while the REST API supports custom automation for teams with engineering resources.

Warmup Requirements: Mailreef provides pre-warmed servers and domains but does not include mailbox warmup. Operators must use third-party warmup tools (Warmup Inbox, Mailwarm, Mailreach, etc.) or manually ramp sending volumes to build mailbox reputation. Skipping this step will result in poor deliverability and potential domain/IP blacklisting.

Ongoing Operations: After initial setup, Mailreef requires minimal hands-on management. The platform handles DNS updates, IP allocation, and server maintenance, while users focus on sending strategy, warmup cadences, and integration with their outreach stack. Monitoring is typically performed through cold email platform dashboards or standalone deliverability tools.

Support: Mailreef provides email and chat support, with response times varying based on plan tier. The team is noted for transparency around infrastructure details and willingness to explain server configurations, making it easier for technical users to troubleshoot or optimize their setup.

Evaluating Mailreef: If you’re operating at scale and need dedicated infrastructure without server management overhead, Mailreef offers strong automation and predictable costs—provided you can handle warmup independently. Review your send volume projections, domain count requirements, and integration needs before committing, and factor in third-party warmup tools when budgeting. For agencies or technical teams comfortable with cold email mechanics, Mailreef’s API-first approach and dedicated IPs provide a solid foundation for high-volume outbound programs.