Features
A complete cold email platform.
Sending, deliverability, warmup, unified inbox, AI copywriting, integrations, analytics — all built to talk to each other so your sequences actually reach humans.
Sending engine
Volume that scales without raising flags
Account rotation
Round-robin across every connected sending account with least-recently-used balancing.
Daily limit + ramp-up
Per-account daily caps with daily +N ramp-up curves so new domains warm up gracefully.
Sending hours + timezone
Restrict each account to specific business hours, days of week, in any IANA timezone.
Spintax + variables
Mustache `{{firstName}}` syntax + `{a|b|c}` spintax produces a unique payload per send.
Stop on reply / auto-reply detect
Live IMAP IDLE listener kills follow-ups the moment a real human replies.
Plain-text mode
One toggle to send plain-text only — historically the highest-deliverability format.
Deliverability tooling
Inbox placement is a science we automate
Domain Health Center
Bulk SPF, DKIM, DMARC, MX, RBL, TLS-RPT checks across every account in one click.
Per-record fix guides
Provider detection (Cloudflare, GoDaddy, Namecheap, Route 53) ships specific setup steps.
Spam test
Send to 10+ seed inboxes (Gmail, Outlook, Yahoo, Zoho, Proton, AOL) and see exact placement.
Content score
Caps detection, spam-keyword analysis, link density, image-only detection — 0-100 score with issues.
Custom tracking domain
Self-service CNAME setup so opens and clicks ship from your subdomain.
Suppression list
Hard bounces, complaints and unsubscribes auto-suppress workspace-wide.
Unified inbox
Reply where you outreached
IMAP IDLE listener
Persistent TCP connection per account → replies appear in 60 seconds or less.
Reply matching
In-Reply-To / References header matching plus subject-line fallback to link replies to the right campaign lead.
Auto-reply detection
Out-of-office and `Auto-Submitted: auto-replied` headers logged but never treated as engagement.
Status tagging
Tag threads as Interested / Meeting Booked / Not Interested / Out Of Office / Wrong Person.
Real-time UI
WebSocket bridge pushes new replies into the unibox without a refresh.
Reply via SMTP
Reply directly from MailFlow — message threads correctly via Message-ID + References.
Email warmup
Build reputation while you sleep
Cross-tenant pool
Workspace accounts (with consent) form an organic warmup pool sending realistic conversation.
IMAP-only manipulation
Move-from-spam, mark-important, threaded replies — all via standard IMAP MOVE / STORE / SEARCH.
Quality scoring
Higher-reputation accounts pair preferentially with higher-reputation accounts.
Daily target slider
Per-account warmup target with per-day ramp-up; reply-rate setting from 0% to 100%.
Hidden mailbox
Warmup messages auto-route to a `MailFlow-Warmup` IMAP folder — your inbox stays clean.
Template variety
Multi-thousand template pool plus AI-generated variations to mimic real human conversation patterns.
Campaign builder
A/B test everything that matters
Multi-step sequences
Up to 7 steps with custom delay-days. Stop conditions are per-campaign.
A/B variants
Multiple variants per step with weighted distribution; track open / click / reply per variant.
AI sequence assistant
Goal + audience + tone + length → fully written sequence in 5 seconds.
Inline rewrite
Per-step "shorter / warmer / sharper CTA" rewrites without leaving the editor.
Live preview
See a rendered email — variables filled, spintax resolved — before launching.
Schedule windows
Per-campaign day-of-week + hour-of-day sending windows.
Analytics
Numbers that reveal what to do next
Per-campaign funnel
Sent → Opened → Clicked → Replied with conversion rates at each stage.
Per-step breakdown
Identify which step in your sequence is doing the heavy lifting.
Per-account performance
Bounce rate, complaint rate, reply rate per sender — kill underperforming accounts before they spread.
Time-of-day heatmap
See which hours generate replies in your audience.
A/B significance
Statistical significance markers on variant winners.
Real-time tick
Sent counter ticks live — no need to refresh.
Platform
For teams that grow past one person
Multi-workspace
Belong to multiple workspaces. Switch with one click.
Roles
Owner / Admin / Member. Granular access to credentials and billing.
Audit log
Every sensitive action logged with actor, IP and metadata.
Webhooks
HMAC-signed payloads. Retries with exponential backoff. Per-event filtering.
REST API
Workspace-scoped API keys with bcrypt-hashed storage and prefix lookup.
Cmd+K command palette
Linear-style global search to navigate or take action without ever leaving the keyboard.
Built for the way your team actually works.
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