Fully managed cold email infrastructure
Anyone can sell you inboxes.
We keep them landing.
✓Ready instantly, no manual work
✓4 years of deliverability expertise
✓Free monthly consultation and assessments
One pool, three providers
Your infrastructure, not shared.
Genuine Google Workspace, Microsoft 365 and Azure accounts. Never relays, never resold seats. Tap a card to read how we use it - or drag to set your own order.
95% inbox placement guarantee⚡ 10-minute setup
Azure Cloud
$50 / tenant
The volume lane · 100 mailboxes per tenant
Deliverability
98%
Warmup progress
84%
Inbox placement
97%
Warmup active · drag to rearrange97% inbox
Google Workspace
$5 / inbox
The precision lane · premium Workspace accounts
Deliverability
97%
Warmup progress
82%
Inbox placement
96%
Warmup active · drag to rearrange96% inbox
Microsoft 365 Exchange
$5 / inbox
The diversification lane · real Exchange tenants
Deliverability
95%
Warmup progress
88%
Inbox placement
95%
Warmup active · drag to rearrange95% inbox
Every batch seed-tested on EmailGuard before handoff
Private Google, Microsoft 365 and Azure infrastructure on your domains. Built, warmed, watched daily, and replaced the moment placement slips. 95% average inbox placement, guaranteed.
$5 per Google or Microsoft inbox
$50 per Azure tenant
See Demo
30 minutes on what you are running now.
No card. Buy one inbox or a thousand.
The problem
Your infrastructure is a black box, and it fails quietly.
No provider tells you why a domain stopped landing. Warmup dashboards show green while your replies fall off a cliff. By the time you notice, you have burned three weeks of a list you paid for.
Nobody is watching
Most providers hand you inboxes and disappear. The account that quietly stopped landing in March is still sitting in your sequencer in June, dragging the whole domain down with it.
Green dashboards lie
Warmup tools measure their own network, not the real inbox. A perfect warmup score and a 0.4% reply rate can happily coexist for months.
Replacements cost you twice
When an inbox dies you pay for the new one, and you pay again in the two weeks it cannot send. Most providers treat that as your problem.
That is what Flyscale is built around. Not selling you inboxes. Keeping the ones you own in the primary inbox, month after month.
Pricing
Two rates. No tiers, no contracts.
The same price whether you buy ten inboxes or ten thousand. The only thing that changes is whose job it is to run them.
Google & Microsoft inboxes
$5
per inbox / month
Any quantity, same rate
Genuine Workspace and Microsoft 365 accounts, 2-3 per lookalike domain, capped at expert-advised daily volume. The precision lane for mid-market and enterprise lists.
Azure Cloud tenants
$50
per tenant / month
100 mailboxes each
50¢ an inbox
One tenant hosts 100 mailboxes on its own domain, isolated from the rest of your fleet. The volume lane, and the cheapest way to reach real scale.
Two ways in. Pick the one that sounds like you.
"I want to look under the hood myself."
Run it yourself
Get started on the platform and buy as many or as few inboxes as you want, then configure them yourself. Domains, DNS and warmup are all in there. About 20 minutes to your first batch.
✓Any quantity you like, no minimum order
✓Domains, DNS and warmup built into the platform
✓Genuine Google, Microsoft 365 and Azure accounts
✓Connect your own sequencer and run it your way
"I cannot afford to get this wrong."
We run it for you
Same rates, plus our team. You bring the domains, we configure them, build and warm every account, upload them into your sequencer, watch placement daily and replace anything that slips. You approve the plan and send.
Minimum
100 Google inboxes or 20 Azure tenants.
✓DNS wired, accounts built and warmed on your domains, handed over ready to send
✓Antifragile OS: weekly evaluations, monthly rotation, proactive replacements
✓Primary-inbox placement tracking on every domain we manage
✓Free replacements, free consultation and a direct line to the team
Same infrastructure, same rates, same 95% inbox placement guarantee either way. Cheaper inboxes exist - they are cheaper because nobody is watching them. Ours include daily monitoring, monthly rotation and free replacements. Not sure which way in? Start free: you can move onto fully managed at any point without rebuying a thing.
Antifragile OS
Sending accounts do not stay healthy on their own. Antifragile OS is the monitoring and rotation layer we run on top of a fully managed system: we watch every account, retire the ones that slip and replace them before your numbers move.
Available on fully managed systems. Your domains, our accounts.
Active monitoring
Every account watched weekly
AI-assisted evaluations score sending performance on every managed account each week, alongside daily bounce and blacklist checks. A slipping inbox is caught by the system, not by your reply rate.
Account rotation
Fresh accounts every month
We configure and rotate in new sending accounts monthly, retiring the ones that are no longer pulling their weight. Your send volume never rests on accounts that have been pushed too long.
Proactive replacement
Swapped before it costs you
When placement on an account drops, we pull it, rest it and replace it at no extra cost. That is what keeps deliverability consistent for teams whose pipeline depends on it.
The monitoring cycle - 4 stages
01
Baseline & provisioning
-Accounts built on your domains
-SPF / DKIM / DMARC verified
-Warmup & volume ramp
-Placement baseline recorded
02
Weekly evaluation
-AI-assisted performance scoring
-Health score per account
-Inbox placement tracking
-Bounce & blacklist checks
03
Rotation & replacement
-Underperformers retired
-Fresh accounts configured
-Volume redistributed
-No cost to you
04
Consistent outcomes
-Top-of-inbox placement
-Higher reply rates
-More meetings booked
-Pipeline you can plan on
Retired
Underperforming accounts retired
Continuous monitoring cycle
Evaluate · Optimise · Replace · Evolve
Deployed monthly
Fresh accounts configured monthly
Built for the AI-filtered internet
Proactive, not reactive
Infrastructure that adapts
Deliverability you can count on
Book a free email infrastructure audit
Thirty minutes, no pitch. We go through your current domains, accounts and placement, tell you honestly where your infrastructure needs support, and what it would take to keep your email landing in the inbox month after month. If the answer is that what you have is fine, we will say that.
I have spent four years inside this problem, and it is harder than anyone admits.
Cold email infrastructure is full of black boxes. No provider tells you why a domain stopped landing. Warmup dashboards show green while your replies fall off a cliff. Half the advice online is a year out of date and the other half has something to push.
I have run every part of it: Google, Microsoft, Azure, relays, resellers, the lot. I have burned domains, rebuilt whole fleets and sat in front of placement data long enough to know which levers actually move the number and which ones are theatre.
So this is not really about inboxes. Anyone can hand you inboxes. What we do is keep you landing in the inbox consistently, month after month, on infrastructure somebody is actually watching.
If you want to run it yourself, the platform is free to join and the rates are the same. Genuinely, go and build it. If you would rather it was somebody else's job, that is what fully managed is for. Either way, start with a free account and have a look. And if you want a second opinion on what you are already running, take the audit and I will tell you straight which one you need.
Daniel Taylor
Founder, Flyscale · daniel@flyscale.io
How it works
From order to first send, honestly.
Three paths, three timelines. Nobody tells you this part straight, so here it is.
01
Order, about 10 minutes
Pick your providers and volume in the platform, or point us at domains you already own. Inboxes are provisioned and in your account the same session.
02
Configured within 12 hours
We wire every DNS record ourselves - SPF, DKIM, DMARC and forwarding - then upload the accounts straight into your sequencer. Smartlead, Instantly and 20 more.
03
Warmed in 14 days, or skip it
A fresh inbox spends two weeks earning its reputation before it sends a single cold email, and we will not rush a mailbox that is not ready. In a hurry? Pre-warmed inboxes ship ready to send today.
04
Watched every day after that
Placement, bounces and blacklists checked daily. The moment an inbox wobbles we pull it, rest it and swap in a fresh one before your numbers feel it.
SPF ✓ DKIM ✓ DMARC ✓ Warmup ✓ Blacklists ✓
Do it yourself
Want to set this up yourself? Read our playbook.
The full setup, step by step, the same way we run it internally. No gate, no email required. If you get stuck halfway through, we can take it over.
Read the playbook →
The comparison
The best cold email infrastructure systems, compared
What we run, what we used to run, what we moved off and why. Including the parts where somebody else is the better answer for you.
Read the comparison →
$5 per Google or Microsoft inbox · $50 per Azure tenant
No minimum to start