Email · Calendar · Contacts · Reminders
Own your inbox. Hosted in Frankfurt. Built on open standards.
Email, calendar, contacts, and reminders — running in Apple Mail, Thunderbird, and Outlook. No ads. No mining. No VC.
Email · Calendar · Contacts · Reminders
The email home you actually own, hosted in Europe
It's your inbox, calendar, contacts, and reminders — working in the apps you already use, with nobody reading your mail to sell you ads.
Email · Calendar · Contacts · Reminders
Email and calendar that work everywhere and answer to you
Keep Apple Mail, Thunderbird, and Outlook — lose the ad targeting and the lock-in. One independent workspace, hosted under EU privacy law.
Email · Calendar · Contacts · Reminders
Your inbox is being read. Here's where it stops.
Big Tech scans your mail and can cut your access overnight. Cirrux is email, calendar, contacts, and reminders — on open standards, hosted in Frankfurt, paid for by you.
Email · Calendar · Contacts · Reminders
Independent email, on open standards, hosted in Europe
Cirrux runs your email, calendar, contacts, and reminders in Apple Mail, Thunderbird, and Outlook — with no investors, no ads, and no one mining your mail.
Works with the apps you already use
Free email costs you everything.
No money changes hands. Your inbox does — and your access can vanish on someone else's call. Here's the deal you didn't sign.
Big Tech mail
- Mail scanned to target ads and train models.
- Access cut overnight — ask the ICC about Microsoft.
- Locked in. Export is a fight. Leaving is worse.
- A free tier built for growth, not for you.
Cirrux
- Nobody reads your mail. You pay, so you're the customer.
- Hosted in Frankfurt, under GDPR, out of US reach.
- Open standards. Walk out with everything, anytime.
- Funded by subscriptions, not an investor exit.
If it's free, you're paying with your inbox
Nobody likes hearing it, but free email has a price — it's just not on the invoice. Here's the trade you've quietly been making.
The free way
- Your messages get scanned to target ads and feed models.
- A vendor can pull your access — it happened to the ICC.
- You're locked into one app, and getting out is a real fight.
- The free tier exists to grow numbers, not to look after you.
The Cirrux way
- Nobody reads your mail — you pay, so you're the customer.
- Your data lives in Frankfurt, under GDPR, out of US reach.
- Open standards mean your data leaves as easily as it arrived.
- Subscriptions fund it, so there's no investor to pay back with you.
Keep your email private without losing your apps
You shouldn't have to choose between convenience and a mailbox nobody mines or can switch off. With Cirrux you don't.
What free email costs you
- Messages scanned, so ads and models get smarter off you.
- Access that a vendor can revoke, as the ICC discovered.
- One locked app, so leaving means losing years of mail.
- A free tier tuned for their growth, not your day.
What Cirrux gives you back
- A mailbox no one reads — because you're the paying customer.
- Frankfurt-hosted storage under GDPR, beyond US reach.
- Open standards, so your data moves with you, not against you.
- Subscription-funded, so your interests stay the only ones.
Free email was never free.
If the product is free, your inbox is the product — and your access is theirs to revoke. Here's the trade you've quietly been making.
Big Tech mail
- Your messages scanned to target ads and feed models.
- Access a vendor can shut off — Microsoft did it to the ICC.
- Locked into one app — exporting is a fight, leaving is worse.
- A free tier built to grow numbers, not to serve you.
Cirrux
- Nobody reads your mail. No ads — you pay, so you're the customer.
- Data stored in Frankfurt, under GDPR, outside US reach.
- Open standards — your data leaves as easily as it arrived.
- Funded by subscriptions, not investors chasing an exit.
Free email sells you. Cirrux doesn't.
Every free inbox monetizes you somehow, and can lock you out at will. This one is funded the honest way — by the people using it.
Big Tech mail
- Mail scanned to target ads and train their models.
- Access revoked at will — exactly what the ICC faced.
- Locked into one app — leaving costs you years of mail.
- A free tier engineered for growth, not for you.
Cirrux
- No one reads your mail. You pay, so you are the customer.
- Data in Frankfurt, under GDPR, outside US jurisdiction.
- Open standards — everything you have can leave with you.
- Funded by subscriptions, accountable only to members.
One login, four tools
Mail is just the start
Inbox, calendar, contacts, reminders. One account. All open standards.
Mail with custom domains
Your domain or @cirrux.me. Unlimited aliases, catch-all mailbox, powerful filtering, instant delivery, IMAP push.
Calendar that syncs
CalDAV events and invites. Synced to Apple Calendar, Thunderbird, your phone. No app required.
Contacts everywhere
CardDAV address book. In step on every device. Share lists. Not handed to an ad network.
Reminders, in sync
Track tasks that sync straight to Apple Reminders and any CalDAV client. Encrypted at rest.
Open standards, no lock-in
IMAP, SMTP, CalDAV, CardDAV. Works in Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5 today. Leave anytime.
One login, four tools
There's a lot more here than mail
Cirrux quietly replaces your inbox, calendar, contacts, and reminders — one account, all on open standards.
Mail with custom domains
Bring a domain you own or grab a @cirrux.me address. With unlimited aliases, a catch-all mailbox, and filtering, every signup gets its own address you can switch off.
Calendar that syncs
Your events and invites sync over CalDAV to Apple Calendar, Thunderbird, and your phone — no special app to install.
Contacts everywhere
A CardDAV address book that quietly stays in step everywhere — share lists without your contacts becoming ad data.
Reminders, in sync
Your task list syncs straight to Apple Reminders and any CalDAV client, encrypted at rest, so nothing lives in an ad engine.
Open standards, no lock-in
Because it's all IMAP, SMTP, CalDAV, and CardDAV, it works in Apple Mail, Thunderbird, Outlook, Mailbird, and DAVx5 — and you can leave whenever you like.
One login, four tools
One account that runs your whole day, privately
Replace your inbox, calendar, contacts, and reminders at once — and keep them all out of an ad engine.
Mail with custom domains
Use your own domain or a @cirrux.me address, and hand every service a unique alias with catch-all and filtering, so you always know who leaked it.
Calendar that syncs
Keep one calendar in sync across Apple Calendar, Thunderbird, and your phone — without a proprietary app.
Contacts everywhere
Your contacts stay current on every device while staying off the networks that profile your relationships.
Reminders, in sync
Track tasks that flow straight into Apple Reminders and any CalDAV client, encrypted at rest, so your to-do list stays yours.
Open standards, no lock-in
Open standards mean it fits Apple Mail, Thunderbird, Outlook, Mailbird, and DAVx5 now — and your data can leave with you later.
One login, four tools
One inbox app shouldn't own your whole life
When mail, calendar, contacts, and reminders all live inside one ad company, leaving means losing everything. Cirrux unbundles that.
Mail with custom domains
Stop renting your address. Use your own domain or @cirrux.me, with unlimited aliases and catch-all so a leaked signup never burns your real inbox.
Calendar that syncs
No more calendars trapped in a proprietary app — CalDAV syncs them to Apple Calendar, Thunderbird, and your phone.
Contacts everywhere
Your relationship graph shouldn't be ad inventory. CardDAV keeps contacts synced without feeding a network.
Reminders, in sync
Your to-do list shouldn't be mined either — reminders sync to Apple Reminders and any CalDAV client, encrypted at rest.
Open standards, no lock-in
The real trap is lock-in. Open standards mean Cirrux works in the apps you have and never holds your data hostage.
One login, four tools
A full workspace, not just an inbox
Cirrux handles email, calendar, contacts, and reminders — one account, every part on open standards, no exceptions.
Mail with custom domains
Run your own domain or a @cirrux.me address with unlimited aliases, catch-all, and filtering. Every signup gets an address you fully control.
Calendar that syncs
CalDAV events and invites sync cleanly to Apple Calendar, Thunderbird, and your phone — no proprietary client.
Contacts everywhere
A CardDAV address book stays exact on every device, with shared lists, and never becomes an advertiser's dataset.
Reminders, in sync
Reminders sync straight to Apple Reminders and any CalDAV client, encrypted at rest — your tasks, under your control.
Open standards, no lock-in
IMAP, SMTP, CalDAV, and CardDAV mean Cirrux works in Apple Mail, Thunderbird, Outlook, Mailbird, and DAVx5 — and you can take everything and go.
Switch without losing a single email
Mail migration sounds scary. It isn't. Cirrux Sync keeps your old inbox live until the new one has it all.
Back up with Cirrux Sync
Mirror your Google or IMAP mailbox to encrypted EU servers. Nothing touched on the old side.
Set up Cirrux alongside
Create the account. Import your mail. Both inboxes receive — test with zero risk.
Point your domain over
Flip the domain to Cirrux. New mail lands here. Old mail's already in.
Switch fully, on your schedule
Move at your pace. Old inbox quiet for weeks? Close it. Your call.
Moving in is easier than you think
Changing email hosts has a scary reputation. Here's the plan that keeps your old inbox running until the new one has everything.
Back up with Cirrux Sync
First, mirror your existing Google or IMAP mailbox to encrypted European servers. Nothing's deleted on the old side — you've got a full copy before anything moves.
Set up Cirrux alongside
Set up your account and import your mail. For a while both inboxes get everything, so you can try Cirrux with nothing on the line.
Point your domain over
When it feels right, point your domain's mail at Cirrux. New mail arrives here, and the old mail is already waiting.
Switch fully, on your schedule
Then take your time. Once the old inbox has been quiet for weeks, close it whenever you're ready — no deadline.
Keep every email and switch on your terms
You get a clean migration with nothing lost and nothing rushed — the old inbox stays live until you don't need it.
Back up with Cirrux Sync
You keep a full, encrypted EU copy of your Google or IMAP mailbox before anything moves, so there's no point where data is at risk.
Set up Cirrux alongside
You run Cirrux next to your current inbox, so you can prove it works for you before committing anything.
Point your domain over
You redirect your domain only when you're confident — and find your old mail already imported and waiting.
Switch fully, on your schedule
You decide the finish line. Close the old inbox once it's quiet, on a timeline that's yours, not a vendor's.
The reason people never leave: fear of losing mail
That fear is fair — most migrations are messy. This one is built so nothing drops and nothing is rushed.
Back up with Cirrux Sync
Worried about losing years of mail? Cirrux Sync mirrors your Google or IMAP mailbox to encrypted EU servers first. The old side is untouched.
Set up Cirrux alongside
Afraid the new inbox won't work for you? Run both in parallel and find out with zero risk.
Point your domain over
Scared of the domain switch? By the time you flip it, your old mail is already imported into Cirrux.
Switch fully, on your schedule
Don't want a hard cutover? There isn't one. Close the old inbox only once it's been quiet for weeks.
Move in without losing a single email
Switching mail hosts sounds scary. Cirrux Sync keeps your old inbox running until the new one already has everything.
Back up with Cirrux Sync
Mirror your existing Google or IMAP mailbox to encrypted European servers. Nothing is touched on the old side — you keep a full copy before anything moves.
Set up Cirrux alongside
Create your account and import your mail. For a while, both inboxes receive — so you can test Cirrux with zero risk.
Point your domain over
When you're ready, redirect your domain's mail to Cirrux. New mail lands in Cirrux; the old mail is already there.
Switch fully, on your schedule
Move at your own pace. When the old inbox has been quiet for weeks, close it — on your timeline, not a deadline.
I was done being the product
For years my whole life ran out of an inbox a US giant controlled. Free. Convenient. Everyone did it. Then Microsoft cut off the International Criminal Court's email. That's the deal, laid bare.
I didn't want another giant. I didn't want to babysit a server — no solution that sacrifices convenience ever wins. I wanted mail that was mine, on old proven standards: IMAP, SMTP, CalDAV.
So I built Cirrux. Backup shipped in summer 2025, the mailbox in December 2025. No VC. No growth-at-all-costs. A workspace I'll put my name on.
Rick Pastoor
Founder, Cirrux
Why I built this
For years I ran my whole life out of an inbox owned by a company I didn't control. I kept telling myself it was fine — until Microsoft pulled the International Criminal Court's email access, and "it's fine" stopped being true.
I didn't want to swap one giant for another, and I'm convinced no solution that asks you to sacrifice convenience will ever win — so self-hosting was out. I just wanted email and a calendar that were genuinely mine, on old, proven standards like IMAP, SMTP, and CalDAV.
So I built it. Cirrux Backup came first in summer 2025, then the mailbox in December 2025. No VC, no growth-at-all-costs — just something I'm happy to put my name on.
Rick Pastoor
Founder, Cirrux
Built so your interests come first
I spent years with my whole life inside an inbox a US provider controlled. When Microsoft cut off the International Criminal Court's email, it stopped being abstract — that exposure was mine too.
What I wanted was simple: mail and a calendar that served me, on old proven open standards like IMAP, SMTP, and CalDAV — without asking anyone to give up the convenience that makes people actually switch.
So I built Cirrux: Backup in summer 2025, the mailbox in December 2025. No VC, no growth-at-all-costs — so the only interests it answers to are yours and mine.
Rick Pastoor
Founder, Cirrux
I got tired of being the product
For years I ran my whole life out of an inbox owned by a company that scanned it. I told myself it was fine — it was free, it worked, everyone used it. When Microsoft shut off the International Criminal Court's email, it wasn't fine anymore.
I didn't want to trade one giant for another, and I don't believe any solution that requires sacrificing convenience will succeed — so self-hosting was never the answer. I wanted email and a calendar that were genuinely mine, on old proven standards like IMAP, SMTP, and CalDAV.
Nothing out there hit all of that without a catch. So I built Cirrux — Backup in summer 2025, the mailbox in December 2025 — with no VC and no growth-at-all-costs. Just a workspace I'm willing to put my own name on.
Rick Pastoor
Founder, Cirrux
I built the email I refused to keep renting
For years my entire life ran through an inbox a US giant controlled. Microsoft cutting off the International Criminal Court's email made the risk impossible to ignore: that access was never really yours.
I refused to trade one giant for another, and I won't pretend self-hosting wins — nothing that sacrifices convenience does. I wanted email and a calendar that were unmistakably mine, on old proven standards: IMAP, SMTP, CalDAV.
So I built Cirrux. Backup shipped summer 2025, the mailbox December 2025 — no VC, no growth-at-all-costs, no investors to repay by selling you. A workspace I stand behind by name.
Rick Pastoor
Founder, Cirrux
Early members
What people say after switching
0 ads, 0 trackers
“Set it up in Apple Mail in ten minutes. Calendar and contacts just synced — it feels like nothing changed, except no one's mining my inbox.”
1 weekend to migrate
“I ran both inboxes in parallel for two weeks like the guide said. Zero lost mail, then I flipped the domain over and never looked back.”
1 alias per signup
“Unlimited aliases changed how I sign up for things. Every service gets its own address, and I can see exactly who sold mine.”
Before you switch
You won't lose your email. Promise.
Will I lose mail when I migrate?
No. Cirrux Sync backs it up first. Run both inboxes in parallel. Flip the domain only when you're sure — your old mail's already imported.
Can I keep Apple Mail or Thunderbird?
Yes. IMAP, SMTP, CalDAV, CardDAV. Works in Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5, Gmail app. No forced client.
Can I use my own domain?
Yes. Any domain you own, or a @cirrux.me address. Plus unlimited aliases and a catch-all mailbox.
What if Cirrux shuts down?
Open standards, so nothing's trapped. Export mail, contacts, calendars and move anywhere. Same way you came in.
Why pay when Gmail is free?
Paying keeps Cirrux independent. No ads, no mining, no investors. You're the customer, not the inventory.
Where's my data stored?
Frankfurt, Germany. Under GDPR. Outside US jurisdiction. Encrypted in transit and at rest.
Before you switch
You've probably got questions
Will I lose mail when I migrate?
No, you won't. Cirrux Sync backs everything up first, then you run Cirrux next to your old inbox until you're sure. You only point your domain over when you're ready, and the old mail is already there.
Can I keep using Apple Mail or Thunderbird?
Absolutely. Cirrux speaks IMAP, SMTP, CalDAV, and CardDAV, so it works in Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5, and the Gmail app. There's no app you're forced into.
Can I use my own domain?
Yep. Bring any domain you own, or use a @cirrux.me address — and you get unlimited aliases plus a catch-all mailbox so every service can have its own.
What if Cirrux shuts down one day?
You're never stuck. Since it's all open standards, you can export your mail, contacts, and calendars and take them to any other host, just like you did coming in.
Why pay when Gmail is free?
Honestly, paying is the point. It's what keeps Cirrux independent — no ads, no email mining, no investors expecting you to be monetized.
Where is my data stored?
On servers in Frankfurt, Germany, under GDPR and outside US jurisdiction — and encrypted both in transit and at rest.
Before you switch
What you get, before you commit
Will I keep all my email?
Yes — every message. Cirrux Sync backs it up first, you run both inboxes together, and you switch the domain only when confident, with your old mail already imported.
Do my current apps still work?
They do, exactly as now. IMAP, SMTP, CalDAV, and CardDAV keep Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5, and the Gmail app working unchanged.
Can I keep my own address?
Yes, and gain more. Bring your domain or use @cirrux.me, plus unlimited aliases and a catch-all so each service gets its own controllable address.
Am I safe long-term?
Yes — you're never locked in. Open standards let you export everything and move to any host whenever you choose.
What do I get for paying?
An inbox no one mines. Your subscription keeps Cirrux independent, so there are no ads and no reason to read your mail.
How protected is my data?
Stored in Frankfurt under GDPR, outside US jurisdiction, with DKIM/DMARC/SPF and 2FA, and encrypted in transit and at rest.
Before you switch
Yes, you can move without losing your email
Will I lose mail when I migrate?
No. Cirrux Sync backs everything up first, then you run Cirrux and your old inbox in parallel until you're sure. Only when you're ready do you point your domain over — and your old mail is already imported.
Can I keep using Apple Mail or Thunderbird?
Yes. Cirrux speaks IMAP, SMTP, CalDAV, and CardDAV, so it works in Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5, and the Gmail app. There's no proprietary client you're forced into.
Can I use my own domain?
Yes. Bring any domain you own, or use a @cirrux.me address. You also get unlimited aliases and a catch-all mailbox, so each service can have its own address you control.
What if Cirrux shuts down one day?
Because everything runs on open standards, your data is never trapped. You can export your mail, contacts, and calendars and move them to any standards-compliant host — the same way you moved to Cirrux.
Why pay when Gmail is free?
A subscription is how Cirrux stays independent. No ads, no email mining, no investors expecting you to be monetized — you're the customer, not the inventory being sold.
Where is my data stored?
On servers in Frankfurt, Germany, under GDPR, outside US jurisdiction. Everything is encrypted in transit and at rest.
Before you switch
Every reason not to switch, answered
Will I lose mail when I migrate?
You won't. Cirrux Sync backs everything up, you run both inboxes in parallel, and you switch the domain only when you're certain — with your old mail already imported.
Can I keep using Apple Mail or Thunderbird?
Yes, without compromise. IMAP, SMTP, CalDAV, and CardDAV mean Apple Mail, Thunderbird, Outlook, Mailbird, DAVx5, and the Gmail app all work — no forced client, ever.
Can I use my own domain?
Yes. Any domain you own, or a @cirrux.me address, plus unlimited aliases and a catch-all so every signup gets an address you control.
What if Cirrux shuts down one day?
It wouldn't trap you. Open standards guarantee you can export mail, contacts, and calendars and move to any compliant host — no permission needed.
Why pay when Gmail is free?
Because paying is what keeps Cirrux independent. No ads, no mining, no investors — you are the customer, never the product.
Where is my data stored?
In Frankfurt, Germany, under GDPR, outside US jurisdiction, and encrypted in transit and at rest. No ambiguity.
Move when you're ready
Take your inbox back
Set up Cirrux beside your current email. Switch on your schedule. Nothing breaks. Nothing's deleted.
Start your Cirrux accountWhenever you're ready
Ready to actually own your email?
Set Cirrux up alongside your current inbox and switch whenever it feels right — nothing breaks and nothing gets deleted.
Create my accountOn your schedule
Get an inbox that finally answers to you
Run Cirrux beside your current email and move on your own timeline — keep every message, lose the surveillance.
Get my private inboxMove when you're ready
Stop letting your inbox be the product
You don't have to rip everything out today. Set up Cirrux alongside your current email and switch when nothing's at risk.
Take my inbox backMove when you're ready
Take your inbox back
Set up Cirrux alongside your current email and switch on your own schedule. Nothing breaks, nothing gets deleted.
Start your Cirrux account