MailheightCold outreach, built for agencies
A deliverability-first cold outreach platform built for agencies running email for many clients.
Manage every client's audience, sequences, and sender reputation from one self-hosted platform, with validation and suppression built in from the start.
Everything an agency needs to run cold email
From prospecting to reply handling, Mailheight covers the full lifecycle of a cold outreach campaign, per client, in one place.
Audience management
Organize contact lists in client folders, import from CSV, add custom fields, and let automatic job-function tagging and smart greeting-name cleanup keep merge tags clean.
Prospecting
Search a built-in prospect database by filters, bulk match by domain or company, or search in plain English with AI.
Segmentation
Build reusable saved segments with live match counts and export any segment to CSV in one click.
Email validation
Verify each list before you send. Contacts are bucketed into valid, catch-all, unknown, invalid, and spamtrap, checked against an internal spamtrap database of 83.6 million addresses.
Deliverability and reputation protection
A global suppression list, hard and soft bounce parsing, business-hours send windows, and daily and hourly rate limits protect your sending reputation.
Campaigns and sequences
Build multi-step drip sequences with conditional steps based on opens or clicks, and run A/B split tests on subject line, from-name, body, or send time.
AI personalization
Mailheight extracts what each client sells from their website, researches each prospect's company, and generates grounded per-lead copy through a draft-then-approve workflow that guards against invented placeholders.
Sending
Send through multiple providers and sender identities with mobile-friendly HTML emails that include an unsubscribe footer.
Inbox and replies
Detect replies through Microsoft Graph, classify genuine replies versus bounces versus auto-replies, and pause on out-of-office with automatic resume.
Tracking and analytics
Track opens, clicks, replies, bounces, and unsubscribes, with verified-open and verified-click filtering to cut out scanner noise.
Multi-client and agency
Client folders, admin and member roles, and per-account data isolation are built in for agencies running email for many clients.
Self-hosted
Runs on your own infrastructure, deployed under your control.
Ready to see it running on your data?
Book a demo and we will walk through how Mailheight handles your client folders, deliverability, and reporting.