Cold Email Infrastructure
Youremailsdeserve
betterthanspam.
Google & Microsoft mailboxes on US IPs, DNS done for you, warmed and wired into your sequencer in minutes. From $2.50/mailbox. That's it, that's the pitch.
- Ready to send in 30 minutes
- US/EU IPs only
- 98%+ inbox placement
Benefits of InboxStack
Provision, warm, and scale
cold email infrastructure
Live in 30 Minutes, Not 48 Hours
Domains registered, DNS pushed, mailboxes provisioned automatically. Watch the live log instead of waiting on tickets.
Pre-Warmed Reputation
Skip the 14-day ramp. Pre-warmed mailboxes arrive with reputation baked in, ready to fire day one.
Deliverability You Can See
Inbox placement, bounce rates, and blacklist status. tracked live, surfaced before reply rates flatline.
Pre-warmed mailboxes
Skip the two-week warmup queue. Grab mailboxes with reputation already baked in and send from day one. Or use our native warmup. smart ramp from 2 to 40 emails/day.
StackGuard monitoring
24/7 blacklist scans, DNS drift detection, bounce tracking, and placement tests. You get pinged before deliverability tanks, not after your reply rate flatlines.
One domain, one workspace
Full isolation per domain. If one domain catches a ban, the rest of your stack doesn't even notice.
- tryacme.ioavail.
- acmeinbox.comavail.
- hello-acme.ioavail.
AI domain finder
One keyword in, a shortlist of available, brandable domains out. Seconds, not Sunday afternoons.
Smart mailbox namer + persona photos
AI generates professional handles and studio-grade profile pictures in bulk. No more john.doe.sales.7@.
Bulk everything
CSV import, bulk profile edits, bulk exports. Built for 1,000 mailboxes, comfortable at 10,000.
“InboxStackrebuiltouroutboundinfrastructureovernight.Wewentfrom61%inboxplacementto96%intwoweeks,whilescalingfrom30to300mailboxeswithoutasingledeliverabilityfire.”
Platform Showcase
One platform for every mailbox, domain, and sequencer
Live in ~30 minutes
Domains registered, DNS pushed, mailboxes spun up automatically. Watch the live log instead of opening tickets.
Isolation by design
One domain per workspace. If a single domain catches a ban, the rest of your stack doesn't even flinch.
DNS handled for you
SPF, DKIM, and DMARC published and verified automatically across every domain you connect.
Comparison
We did the comparison table so you don't open six tabs.
How Purchasing Works
Buying is the easy part. On purpose.
Create your account
Free account, no card needed to look around.
Add domains
Buy in-app (we register + Cloudflare-manage them, you own them) or connect your own. DNS verifies automatically.
Configure your stack
Pick provider (Google / Microsoft), set quantity, let AI autofill names and personas. Price per mailbox shows live.
Pay your way
Simple monthly plans — pick what fits and scale as you grow.
We provision
Mailboxes live in ~7 minutes, DNS pushed, warmup auto-starts. Pre-warmed boxes arrive ready to fire.
Export & send
One click into your sequencer. StackGuard watches your back from here.
Pricing
Pay only when you send.
Pay-as-you-go
What's included
- Automated DKIM, SPF, DMARC setup
- Unlimited mailbox export
- Domain purchase or bring-your-own
- Cloudflare-managed DNS
- US/EU IP accounts exclusively
- Live chat support, even weekends
- OAuth push to your sequencer
Google Workspace
Microsoft 365All plans include
Refund policy , short version: we're reasonable. Unused balance is refundable.
Wall of Love
People say nice things.
We screenshot them.
“We were losing two days a month to DNS. Switched to InboxStack. it's now a 7-minute task.”
“Their support replied on a Sunday at 11pm. I'm never going back to ticket-purgatory vendors.”
“Inbox placement jumped from 71% to 96% in two weeks. Same offer, same lists, same sequencer.”
“Scaled from 60 to 400 mailboxes across 14 client workspaces without a single deliverability fire.”
“We were losing two days a month to DNS. Switched to InboxStack. it's now a 7-minute task.”
“Their support replied on a Sunday at 11pm. I'm never going back to ticket-purgatory vendors.”
“Inbox placement jumped from 71% to 96% in two weeks. Same offer, same lists, same sequencer.”
“Scaled from 60 to 400 mailboxes across 14 client workspaces without a single deliverability fire.”
“Pre-warmed mailboxes saved us a launch. We were sending on day one, not week three.”
“Setup took 9 minutes including coffee. We had 40 mailboxes warming the same afternoon.”
“Deliverability jumped from 68% to 94% in three weeks. Our reply rates doubled on the same lists.”
“Cheapest infra we've used and somehow the most reliable. Make it make sense.”
“Pre-warmed mailboxes saved us a launch. We were sending on day one, not week three.”
“Setup took 9 minutes including coffee. We had 40 mailboxes warming the same afternoon.”
“Deliverability jumped from 68% to 94% in three weeks. Our reply rates doubled on the same lists.”
“Cheapest infra we've used and somehow the most reliable. Make it make sense.”
Faq
Asked often. Answered honestly.
Infrastructure, not a sequencer. We set up and maintain the domains and mailboxes; your outreach tool does the sending. Think of us as the foundation under Instantly/Smartlead/ReachInbox.