Features
Powerful Features for Email Success
From AI-powered warmup to enterprise-grade security, WarmupSleuth covers the full email deliverability stack with 16 powerful feature areas.
AI-Powered Email Generation
GPT-4 generates unique, contextual email conversations that are indistinguishable from real human exchanges. Each email varies in topic, tone, and length to avoid spam filter detection patterns. Our AI adapts to your industry and communication style over time.
4-Phase Warmup Algorithm
Our proven warmup engine gradually increases sending volume over 45+ days across four distinct phases. Phase 1 starts cautiously with 2-3 emails per day, Phase 2 scales to 35, Phase 3 reaches 50, and Phase 4 achieves full capacity at 50-100 emails per day. Each transition is guided by real-time reputation data.
9 Email Provider Support
Connect Gmail, Outlook/Office 365, Yahoo, Zoho, Amazon SES, SendGrid, Mailgun, Brevo, and any custom SMTP/IMAP server. OAuth2 authentication for Gmail and Microsoft ensures secure, token-based access without storing passwords.
Real-Time Reputation Scoring
Monitor your sender reputation with a composite score calculated from inbox placement rate, open rate, spam rate, and bounce rate. The score updates in real-time and triggers automatic throttling when issues are detected, protecting your domain before damage occurs.
Smart Auto-Reply System
Achieve a 60-80% reply rate with realistic delays between 30 minutes and 4 hours. The system builds natural conversation threads that mimic genuine business communication, training email providers to recognize your messages as wanted.
Spam-to-Inbox Rescue
Automatically detects warmup emails that land in spam folders and moves them back to the inbox. This trains email provider algorithms to recognize your messages as legitimate, steadily improving your inbox placement rate over time.
DNS Health Monitor & Wizard
Continuously monitors SPF, DKIM, DMARC, and MX records for your domains. The guided DNS setup wizard auto-detects your provider, generates correct records, and verifies propagation. Get instant alerts before misconfiguration impacts deliverability.
White-Label Agency Mode
Full white-label solution with custom branding, domains, and isolated sub-accounts for your clients. Each client gets their own dashboard while you maintain complete control from a central agency panel. Built for agencies managing dozens of client accounts.
REST API with 300+ Endpoints
Full-featured RESTful API spanning 26 route files. Manage mailboxes, warmup sessions, analytics, organizations, and billing programmatically. Per-plan rate limiting via Redis sliding window ensures fair usage across all tiers.
Advanced Analytics & Reports
Comprehensive dashboards with deliverability heatmaps, email flow Sankey diagrams, and daily/weekly/monthly trend reports. Track inbox placement rate, bounce rate, spam rate, and engagement metrics across all your mailboxes in one view.
CRM Integrations
Native integrations with Salesforce, HubSpot, and Pipedrive. Sync contacts, track deliverability per lead, and coordinate warmup with your sales pipeline. Webhook support enables custom integrations with any CRM or marketing platform.
Multi-Channel Outreach
Go beyond email with integrated LinkedIn, Twitter, SMS, and WhatsApp channels. Manage all your outreach from one platform and coordinate warmup timing with multi-channel sequences for maximum deliverability.
Automation Workflows
Visual workflow builder with 29 triggers and 27 actions. Automate warmup start/stop, reputation alerts, CRM syncs, team notifications, and more. Chain multiple actions together with conditional logic for powerful automation sequences.
Team Management & RBAC
Role-based access control with 50+ granular permissions. Create custom roles, organize teams into workspaces, and allocate mailbox quotas per department. Support for single and bulk CSV invites with configurable expiration.
Enterprise Security
2FA/TOTP authentication, AES-256-GCM encryption for email credentials, Argon2id password hashing, IP whitelisting, and TLS 1.3. Full GDPR compliance with data retention policies and right to deletion. Audit logging for all critical actions.
11 Free Deliverability Tools
Professional-grade tools available to everyone: SPF, DKIM, and DMARC generators, spam score checker, email verifier, deliverability test, mailbox calculator, sequence builder, signature builder, template checker, and blacklist monitor. No signup required for basic usage.