Almost everyone searching for a Posteo alternative is doing it for one reason: they wanted you@yourbusiness.com and found out Posteo doesn't do custom domains. Not on a higher tier, not by asking support. At all.
That's worth understanding properly rather than treating as a gap, because the reason is one of the more principled decisions in this industry, and it tells you exactly who Posteo is for.
Why a Posteo Alternative Is Your Only Option for a Custom Domain
A custom domain has to be registered to a named person at a real address. That's how domain registration works everywhere.
Posteo's whole model is that they hold no customer identity data — no names, no addresses, and payment can be made anonymously. As their own FAQ explains, supporting custom domains would force them to start storing that information for every customer using one, and to make it available to Germany's Federal Network Agency on request.
So they don't. It isn't a feature waiting on a roadmap — offering it would break the thing the service exists to protect.
Take a moment with that before dismissing it. Most providers would have shipped custom domains, collected the data and written a privacy policy explaining why it's fine. Posteo gave up a large market instead. Whatever you decide, that's worth respecting.
It also settles the question cleanly. If your business needs mail on your own domain, no amount of liking Posteo changes the answer, and any Posteo alternative you look at will be able to do it.
What €1 a Month Buys, and What a Posteo Alternative Costs
Their pricing is a single line, which is refreshing, and it sets the bar any Posteo alternative gets measured against: €1 a month.
| What | Included |
|---|---|
| Storage | 4 GB, upgradeable |
| Alias addresses | 3, upgradeable |
| Calendars | 3, upgradeable |
| Protocols | IMAP, POP3 and SMTP |
| Two-factor | Yes, TOTP |
| Custom domain | Not available |
Note the protocols row, because it separates Posteo from the rest of the privacy tier, and from more than one provider a Posteo alternative search will surface. Tuta has no IMAP at all and Proton needs a Bridge on every desktop. Posteo gives you plain IMAP, POP3 and SMTP, so Outlook, Apple Mail and Thunderbird just work. For a privacy-focused provider, that's an unusually pragmatic choice and they deserve credit for it.
The aliases are at posteo.de or posteo.net — useful for separating contexts, but still not your domain, and everyone you write to sees it.
What No Posteo Alternative Gives You Back
Genuine anonymity. No identity data held, anonymous payment accepted. Very few providers can say that and mean it.
Standard protocols on a privacy service. As above — the encryption-first competitors mostly can't offer this, and Posteo does.
One price, no tiers. €1 a month with paid upgrades for storage or aliases. Nothing is gated behind a plan you have to guess at.
Green hosting and no advertising, which is a real reason people choose them rather than a marketing line.
Free individual support at a euro a month, which is more than several providers charging five times as much manage.
Where a Posteo Alternative Changes Shape
The first difference is the whole article, so it's worth stating plainly rather than burying in a list.
Your own domain, which is the point. Mail on the domain you already own, with SPF, DKIM and DMARC configured for you — either through a scoped Cloudflare token with the change previewed before it's written, or one click via Domain Connect at registrars where you hold no token. Our free plan covers 10 domains; Agency reaches 1,000. See DNS setup.
Addresses a team shares. support@ as a shared mailbox with real membership, so everyone sees the thread instead of getting copies. Posteo is a personal mailbox by design and has no equivalent.
Aliases and catch-all on your own domain. 30 to 100 aliases per mailbox depending on plan, plus catch-all routing so an address you never created still reaches someone.
Mailboxes hosted elsewhere. Reading a Gmail or Microsoft 365 account over IMAP from the same interface, with replies leaving through that provider. See the unified inbox.
The honest trade, stated clearly: Posteo holds no identity data about you and we do. If anonymity from your own provider is the requirement, that's a real difference and it points back to them.
The Verdict, Whoever You Are
This is the rare comparison where a Posteo alternative is right for some readers and plainly wrong for others.
One person who wants a private personal mailbox. Stay with Posteo. A euro a month, full IMAP, no identity data held, no ads, green hosting — nothing in this article beats that for personal mail, and a Posteo alternative would be a downgrade on the thing you chose them for.
One person with their own domain. You have to move, and it isn't a close call — Posteo structurally cannot host you@yourbusiness.com. What you're choosing between is other providers, and the things worth comparing are aliases per mailbox, whether DNS is applied for you, whether the calendar lives in the same window as the mail, and what happens when a second person needs the same address.
A team. Posteo was never built for this. Every account is one person, there's no shared mailbox with membership, no per-mailbox storage caps, no admin to add or remove people. Flat pricing that doesn't move between 4 people and 400, role addresses that cost nothing, delivery-time filters and two-factor on each person's mailbox are all on the other side of the decision.
Mail for several companies. Not applicable at all, which is the cleanest way to put it. That work needs bulk domain and mailbox provisioning, setup invites so you never hold a client's password, address verification in the same account, 13 interface languages including right-to-left, and your own branding on the dashboard and webmail your clients log into.
Short version: Posteo is excellent, and it is excellent at being a private personal mailbox. The moment a domain you own enters the picture, they've told you themselves that they're not the answer.
Frequently Asked Questions
Can I use my own domain with Posteo?
No, and it isn't a tier or a support request. Custom domains would require them to store customer identity data and disclose it to the Federal Network Agency on request, which contradicts their data-minimisation model.
Does Posteo support IMAP?
Yes — IMAP, POP3 and SMTP all work, so any standard client connects. That genuinely separates them from Tuta, which has no IMAP, and from Proton, which needs Bridge running on the desktop.
How much does Posteo cost?
€1 a month, including 4 GB of storage, three aliases and three calendars, each upgradeable for a small additional charge. There are no tiers to compare.
What do the aliases give me?
Three addresses at posteo.de or posteo.net, useful for separating contexts. They're not on your own domain, so anyone you email still sees Posteo's.
Is a Posteo alternative less private?
On one axis, yes, and it's worth naming: a provider hosting your own domain necessarily knows who you are, because the domain is registered to you. Encryption in transit and at rest, two-factor and no advertising are comparable. Anonymity from the provider itself is what Posteo uniquely offers.
Can I move my mail out of Posteo?
Yes, easily, because they support IMAP. A migration is a standard mailbox copy that keeps folders and read state, reconciled against the source afterwards. See bulk migration.
What about my calendars and contacts?
Posteo syncs both over CalDAV and CardDAV, so they move to any provider that speaks the same standards — CalDAV and CardDAV here work identically.
