The fix
A closed messenger, styled like email, that keeps your people talking when the internet to the outside world doesn't.
Dart Mail is a closed messaging network, built to look and feel like email, that you share with your own staff, suppliers and key contacts — so you can still reach each other even if the cables connecting Britain to the rest of the internet don't work.
In plain terms
No new habits, no rollout project
Just a second account, ready before you need it.
GBLooks like email
Nothing to learn.
Compose, reply, attachments — if your team can use email, they can use this. No training, no rollout.
GBPre-set up, waiting
Nothing to install on the day.
Your account is ready before you need it — no setup, no scramble, on the day it actually matters.
GBNever leaves Britain
Sign-in and certificates included.
Runs on named UK servers, with the sign-in and security certificates that keep it working staying in the country too. Corporate plans have an on-premise option too.
Wny Buy
You already pay for things you hope never to use.
Fire insurance. A backup generator. A disaster-recovery site for the server room. This is the same instinct, applied to something every business now depends on completely: being able to reach the people who work for you, sell to you, and buy from you.
The cost of losing that for a week is customers you can't reach, staff you can't coordinate, and a board asking why nobody saw it coming.
What it looks like
Familiar, on purpose.
This is the shape of it: an inbox, a message list, nothing to learn.
Monthly standby test — all clear
This month's routine test message sent and received without issue. Sign-in, delivery and certificates all confirmed working on the UK network. No action needed — this account is ready if you need it.
When it switches on
The day your normal setup can't be reached.
Microsoft, Google, whoever you use today — the day the cables linking Britain to the rest of the world are cut or degraded is the day their sign-in servers abroad stop answering. Here's what happens on Dart Mail instead:
Your computer
Looks up the address using UK-based DNS — never leaves the country to find you.
UK mail servers
A distributed network of British servers receives your mail — on your own premises, if you're on a Corporate plan.
Your browser
Opens Dart Mail, secured by certificate authorities based here in the UK — not abroad.
You send
Messages reach colleagues and external contacts, also on Dart Mail — with no traffic ever leaving the UK.
How far it goes
It depends how bad it gets.
Three states, from an ordinary day to the worst one.
| State | What's happening | What you do |
|---|---|---|
| 1 — Normal | Normal internet. | Use your current mail service — G Suite, Office 365, whatever you're on today. |
| 2 — Degraded | The UK's external internet links are sabotaged. Only UK-to-UK traffic works — G Suite and Office 365 are either down or heavily degraded. | You can message internally and externally through Dart Mail — any plan. |
| 3 — Critical | Full internet outage from a more sustained attack. Your premises is running on backup power; all external traffic — including cloud Dart Mail — is down. | Dart Mail Corporate, on-premises, still works — your local networked users can keep communicating (for example, within a factory site or hospital). Offsite mail sends when it can get through - even if this is intermittent. |
It's designed from the ground up to work in a closed-off UK internet.
Even the fonts you see on screen are baked into Dart Mail's own systems — most websites quietly pull theirs from Google or Adobe's servers abroad, every time the page loads.
Straight answers
The questions every CEO actually asks.
- Isn't Microsoft 365 already resilient enough? These systems rely on a lot of moving parts and are designed for speed and efficiency, not georgraphical resilience. We don't know how these will cope.
- Can I use it to message anyone, like normal email? No — that's deliberate. It only works between people on the network, which is exactly what makes it reliable when ordinary email depends on servers abroad it can't reach.
- Is this a big procurement decision? No — priced and structured to be a same-day yes, not a six-month IT project.
Reserve your business's standby messenger — before you need it.
Built by Dartfields Ltd, grounded in Parliament's own findings on UK infrastructure risk.