Send more outbound without burning your domains.
Sendqube warms up new mailboxes, rotates sends across inboxes, and watches for bounce and blacklist issues before they tank your reply rate — so cold outreach still gets read.
Start your 30-day free access — no card required.
Send from the mailbox your prospects already recognize
Every mailbox gets warmed up, rotated, and watched.
New mailboxes ramp up gradually before full-volume sending. Sends rotate across every connected inbox so no single mailbox carries the full load. Bounce and blacklist signals are tracked per mailbox, so problems surface before your reply rate drops.
The complete workflow from contact import to attributed interest.
Sendqube keeps outreach, engagement, verification, attribution, and contact intelligence in one focused workspace.
Multi-step sequences
Per-step delays, merge tags, spintax, same-thread and new-thread follow-ups.
Mailbox rotation
Sends rotate across every connected mailbox, weighted toward whichever has the most daily volume left.
Email warmup
New mailboxes ramp gradually with real cross-workspace engagement before full-volume sending.
Inbox visibility test
Send a tagged test to seed accounts across providers and see Inbox vs Spam.
Webhooks
A signed callback the moment an email is sent, opened, clicked, replied to, or unsubscribed.
Bot vs Human Filtering
Separate likely automated activity from likely-human opens and clicks.
Mailbox connections
Connect Microsoft 365, Gmail during Beta, or an SMTP mailbox on your own domain.
Contacts CRM
Import contacts from CSV, organize them with tags and saved lists, and enroll focused segments.
Email verification
Validate every contact for free — format, MX, disposable-domain, and direct SMTP checks. No credits, no paid vendor.
Reply detection
Detect replies and automatically pause outreach so contacts are not chased after responding.
Open and click tracking
Measure engagement across sequences and understand which messages attract attention.
AI writing feedback
Get suggestions for tone, subject lines, readability, calls to action, personalization, and spam risk.
Sequence Quality Score
Review writing, campaign setup, and mailbox health before launching a sequence.
Website Visitor Tracking
Connect website visits back to campaigns, contacts, sequences, and email events.
Campaign attribution
See which campaign and contact generated meaningful website activity.
Lead scoring
Prioritize contacts using outreach engagement and attributed website behavior.
Reusable templates
Save any step or full sequence as a template, then clone it into new campaigns in one click.
Contact activity timeline
Every email, reply, enrollment, and website visit for a contact, merged into one chronological view.
Bounce tracking
Catch hard bounces immediately and delayed bounces automatically, keeping your sender reputation clean.
One tool, your whole outbound motion.
Sequences, contacts, mailboxes, and analytics — no tab-switching between five different apps.
One workspace, five things it's actually good at.
Click through to see what each part of Sendqube looks like day to day.
Launch your first sequence in three steps.
Connect a mailbox, organize your contacts, and start a measured campaign.
Connect a mailbox
Use Microsoft 365, Gmail during Beta, or SMTP on your own domain.
Import contacts
Upload a CSV, remove duplicates, organize contacts, and verify addresses before sending.
Launch a sequence
Write your steps, choose threading behavior, preview personalization, and begin sending.
Know what happens after the click.
Connect outreach activity with website behavior, helping you identify engaged prospects even when they do not reply immediately.
- Track visitor sessions and returning visits
- Attribute visits to contacts and campaigns
- Connect website activity to email events
- Prioritize prospects with lead scoring
Built for teams and individuals who live in the inbox.
Use Sendqube for sales, recruiting, agency outreach, partnerships, and founder-led growth.
Sales teams
Reach focused prospect segments and measure replies.
Marketers
Connect campaign engagement to website activity.
Recruiters
Run personalized candidate outreach at scale.
Founders
Reach customers, partners, and investors directly.
Agencies
Organize outbound workflows in one workspace.
Freelancers
Build a repeatable client-acquisition process.
Your contacts, mailbox, and workspace data stay yours.
Workspace data is scoped by organization, SMTP credentials are protected at rest, and unsubscribe requests are honored across your workspace.
One plan. Everything included.
Paid tiers aren't live yet — every new workspace gets the full toolkit below on the Basic plan. We'll notify you before any upgrade or billing goes live.
No card required during your trial. Billing isn't live yet — you'll be notified when upgrades are available.
- 500 contacts
- 2 connected mailboxes (Gmail Beta, Microsoft, or SMTP)
- Unlimited free verification (format, MX, disposable-domain, and SMTP checks), plus 50 deeper verification credits/month
- 2 AI writing assistant uses per day
- AI Drafts — personalizes outreach and drafts replies to inbound responses for your review before anything sends
- Multi-step sequences with same-thread & new-thread follow-ups
- Reply detection (Gmail, Microsoft, SMTP) with auto-pause on reply
- Open & click tracking with bot-vs-human filtering
- Sequence Quality Score
- Merge tags, spintax, CSV import, contact lists
- Unsubscribe handling across your workspace
- Help Center + support tickets
A few things are still on the way.
These are intentionally kept separate from the features above so visitors know exactly what they can use today.
Frequently asked questions
The important details before you start.
Ready to build your first sequence?
Start your 30-day free trial with full access and unlimited free email verification checks.
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