mailbox.org has spent five years telling business customers its prices don't move. That streak ended on September 1, 2026, when the German provider raised its per-user rates for private and business customers and confirmed in its own announcement that the same increase applies to resellers reselling its mailboxes. If you're an MSP or agency that has quoted mailbox.org to a privacy-conscious client, or is weighing it as the GDPR-forward alternative to reselling Google Workspace or Microsoft 365, the timing is a good excuse to look past the marketing page and into what the reseller program actually gives you: how billing works, whose name shows up when a client signs in, and how much of domain setup is still manual. Atriomail approaches the same reseller decision differently, with one published per-mailbox wholesale price and a paid add-on that puts your own name on the panel instead of the vendor's.

This isn't an argument against mailbox.org's mail service, which is genuinely well regarded for German-hosted, privacy-first infrastructure. It's a look at what changes, and what doesn't, when you try to resell it to 20 to 200 client domains the way you'd resell any other line item on your invoice.

Table of Contents

Key Takeaways

Point Details
mailbox.org raised business and reseller prices on September 1, 2026 Standard moved to €4/user/month (20 GB mail + 10 GB Drive), Premium to €12/user/month (50 GB mail + 100 GB Drive). mailbox.org's own announcement states the increase applies to reseller-billed accounts too.
No published reseller wholesale rate The reseller program lets you "set your own prices," but mailbox.org doesn't publish what it charges resellers below the public per-user rate.
Clients always see mailbox.org's brand mailbox.org explicitly avoids "anonymous white label solutions." Its logo appears at every login, on every plan and partner tier.
Atriomail publishes one wholesale price and a paid path to your own brand $1.39/mailbox/month with 15 GB included, at any scale. White-label branding (a one-time setup fee plus a monthly subscription) has no minimum mailbox count.

Compare the numbers before you quote either one. Atriomail charges $1.39 per mailbox per month with 15 GB included, no long-term contract and no mailbox minimum. Creating an account is free and needs no card; mailboxes are billed from the first one.

Create a free account   See per-mailbox pricing

What Changed on September 1

mailbox.org, the Berlin-based email and productivity suite operated by Heinlein Support, held its business pricing steady for more than five years. That changed on September 1, 2026: the Standard business plan moved to €4 per user per month (about $4.60 at September 2026 exchange rates) with mail storage doubled to 20 GB plus 10 GB of Drive storage, and Premium moved to €12 per user per month (about $13.80) with 50 GB of mail and 100 GB of Drive (mailbox.org's own plan-adjustment announcement, checked September 2026). The Light plan, at €1 per user per month with 2 GB of mail, was left unchanged.

mailbox.org's announcement is explicit that the new rates apply to reseller accounts too: the new conditions "also apply to resellers from September 1st," with no technical changes required, only a note to review how the increase is communicated to clients. For an MSP already reselling mailbox.org, or evaluating it as a privacy-first alternative for GDPR-conscious clients, that's a good moment to look past the marketing page: how billing works between you and mailbox.org, whose name your client sees, and how much of domain setup is still manual. Atriomail publishes one wholesale number, $1.39 per mailbox per month with 15 GB included, and hasn't required a client-facing price conversation of its own since launch.

One published wholesale price, no reseller tier to unlock. Atriomail charges $1.39 per mailbox per month with 15 GB included, whether you're reselling one domain or two hundred. Creating an account is free and needs no card; mailboxes are billed from the first one.

Create a free account   See pricing

No Wholesale Rate, and It's Billed in Euros

mailbox.org's reseller page is clear about what you control: you set your own prices, and billing to your clients stays in your hands. What it doesn't state anywhere in its reseller pages or knowledge base is what mailbox.org itself charges a reseller per mailbox. There's no published wholesale rate, no discount percentage, and no volume tier where a lower per-user cost kicks in. The only public number is the same retail price every direct customer sees: €4/month Standard, €12/month Premium.

Run the math on a 200-mailbox book at that public rate, with no negotiated discount: 200 × €4 = €800/month, about $920 at September 2026 exchange rates. That's already close to what many MSPs bill a client for a fully managed, branded 200-mailbox service, before support time or card fees, leaving little room for margin unless you negotiate a private rate directly with mailbox.org, something its public pages don't describe how to do. Billing also runs in euros by default: a reseller invoicing US clients in dollars absorbs currency conversion on every renewal, a friction the reseller page doesn't address.

mailbox.org (200 × €4, no reseller discount published) ~$920/mo Atriomail wholesale (200 × $1.39) $278/mo $0 $250 $500 $750 $1000
Monthly cost to serve 200 mailboxes at each provider's public rate. mailbox.org publishes no reseller discount below its retail price; Atriomail's $1.39 wholesale price is the same number at any scale.

Atriomail's wholesale price is published and fixed: $1.39 per mailbox per month, 15 GB included, no volume tier to reach and no currency conversion, since both the wholesale charge and your resale price run in US dollars. The same 200-mailbox book costs $278/month wholesale. You set your own resale price on top of that; Atriomail doesn't publish a retail rate for you to undercut or match, because there isn't one to negotiate around, only the $1.39 you already pay. The per-mailbox pricing model explained walks through how that wholesale number turns into a margin at any resale price you choose.

Your Brand Never Appears on the Login

Most reseller programs treat branding as a tier you unlock. mailbox.org treats it as a decision it has already made. Its own reseller page states the philosophy directly: mailbox.org aims to build genuine partnerships rather than offer anonymous white-label solutions, so customers benefit directly from the mailbox.org brand rather than a reseller's branding. In practice, every client you sign up through the reseller dashboard sees the mailbox.org name and logo at login, on every plan, at every partner level. There's no tier, minimum or add-on fee that changes it.

For some MSPs that's a non-issue: mailbox.org's German hosting and privacy positioning is itself part of the pitch, and clients who chose the MSP for that reputation may be reassured, not put off, by a recognizable third-party name at login. But for an agency billing email as one line item inside a broader managed service, where the pitch is "we run your infrastructure," a vendor's logo on every login is friction at every support call.

Atriomail's white-label add-on exists specifically for that second case. It's a paid add-on, a one-time setup fee plus a monthly subscription, with no minimum mailbox count to unlock it. Once our team configures your branded hostname, which requires you to control DNS for it, the control panel on that hostname shows your product name and favicon, and the help center pages show your logo. The honest version of what changes and what doesn't: some layers stay neutral or still show the platform, including raw message headers, the webmail interior, payment pages, system emails and some platform legal documents; we tell you exactly which before you launch. What white-label email actually covers for an agency and the branding practices that make it land with clients are both worth reading before deciding how much branding matters for a specific relationship. The domain setup and branding guide covers the DNS side of getting a branded hostname pointed correctly.

DNS Setup and Billing Automation Are Manual

Adding a client domain to mailbox.org follows the same sequence at every reseller tier: a TXT record with an activation code to verify domain ownership, then three MX records at specific priorities pointing to mailbox.org's mail servers, then SPF, DKIM and DMARC added separately for deliverability (mailbox.org's knowledge base, checked September 2026). None of it publishes automatically to any DNS host; every domain, on every plan, gets the same manual record-by-record setup. mailbox.org's own documentation warns that mailboxes should exist before the MX records switch, or incoming mail bounces as undeliverable during the gap.

Billing and provisioning follow a similar pattern: a web dashboard to create, adjust and delete customer accounts, PDF and CSV invoice exports, and an API for larger operations to script the same actions. What's absent is a connection to the billing systems most MSPs already run: no WHMCS module, no Blesta module, nothing that turns a client signing up in your own storefront into a provisioned mailbox.org account without a manual step or custom API work.

Atriomail automates the piece mailbox.org leaves entirely manual, for two specific DNS hosts: on a connected Cloudflare or Namecheap account, adding a domain that's already in that account publishes MX, SPF, DMARC, autodiscover, autoconfig and the DKIM key without copying a single record. For every other DNS host, the DNS Setup dialog lists exactly what to add with a copy button next to each record. The guide to connecting Cloudflare and Namecheap for automatic mail DNS covers the setup and why the connect-then-import order matters. On billing, Atriomail's WHMCS module (version 3.1.1, built for WHMCS 9) handles Create, Suspend, Unsuspend, Terminate and Change Package, so a client ordering an email product in your existing WHMCS store creates their Atriomail domain and first mailbox without a manual step. The multi-client email management guide for agencies covers what a properly integrated provisioning module should handle versus what still needs a human.

mailbox.org vs Atriomail for Resellers

Dimension mailbox.org Atriomail
Price per mailbox €4/user/month Standard, about $4.60 (September 2026 rate); no published reseller discount (mailbox.org, September 2026) $1.39/mailbox/month, any scale
Included storage 20 GB mail + 10 GB Drive (Standard, effective September 1, 2026) 15 GB per mailbox
Extra storage Upgrade to Premium (€12/user/month, 50 GB mail + 100 GB Drive); no incremental storage add-on published $0.60 per 5 GB block per mailbox per month, billed on the size you set
How you bill each client Reseller sets own prices and invoices clients directly; mailbox.org provides a web dashboard and API for provisioning, plus PDF/CSV invoice exports WHMCS client-area actions create recurring charges at your retail price; panel and API changes don't sync into WHMCS billing on their own
WHMCS module None published; provisioning is via web dashboard or API only v3.1.1 (WHMCS 9): Create, Suspend, Unsuspend, Terminate, Change Package
DNS setup Manual per domain at every host: TXT verification plus three MX records, then SPF, DKIM and DMARC added separately Automatic on Cloudflare and Namecheap; DNS Setup dialog with copy buttons elsewhere
Migration tooling Audriga relocation service; free for private-plan customers, a fee based on the work involved for business customers (mailbox.org knowledge base, September 2026) Built-in IMAP migration, no charge; works with any server that accepts IMAP sign-in with a password
White-label / what the client sees Always mailbox.org's name and logo at login; the reseller program is explicitly not anonymous white-label, at any tier Paid add-on (one-time setup fee plus monthly subscription); your product name and favicon on your branded hostname, no minimum mailbox count
Contract / minimum Monthly billing, no annual contract; no published minimum mailbox count for resellers Monthly billing, no long-term contract, no minimum mailbox count
Support hours 48-hour ticket response (Standard), 24-hour plus phone (Premium); a 24/7 emergency hotline is available only through the separate Platinum service package (€250/month, unlimited mailboxes) Business hours

When mailbox.org Makes Sense

mailbox.org is a legitimate choice for specific reseller situations, not a product to talk every client out of:

  • The client's real requirement is German or EU-hosted infrastructure. mailbox.org's positioning and its price-increase announcement both lean on financing its German data centers specifically. For a genuine data-residency requirement, that's a concrete answer Atriomail doesn't publish a matching claim for.
  • A visible, established third-party name is reassuring, not a liability. Clients choosing an MSP for its privacy-forward recommendations may trust a known, GDPR-first brand at login more than an unfamiliar one, white-labeled or not.
  • The client wants the bundled suite, not just a mailbox. Calendar, address book, encrypted Drive storage, an online office suite and video conferencing come with every business plan.
  • Mailbox counts are low enough that manual provisioning isn't a burden. A handful of client domains through the web dashboard is a very different load than 200 domains needing WHMCS automation.

Where Atriomail Fits

Work through the same 200-mailbox book on both sides. On mailbox.org, at the public Standard rate with no negotiated discount, you're paying roughly $920/month to serve those mailboxes, which leaves little room to bill a client anything meaningfully above that and still call it a margin. On Atriomail, the wholesale cost for 200 mailboxes is $278/month. Bill clients $5/mailbox and you're at $1,000/month, a margin of $722/month before card fees, support time and any white-label fee. That gap exists because Atriomail publishes one number for every reseller at every scale, instead of a rate left to a conversation that isn't documented anywhere public.

The decision isn't only about the spread, though. If your pitch to clients depends on German data-center hosting or a recognizable GDPR-focused brand at login, mailbox.org's positioning does something Atriomail doesn't claim to do, and no per-mailbox margin changes that. But if the pitch is that you run the client's infrastructure, on your invoice, under your name, with billing that plugs into the WHMCS store you already operate, mailbox.org's program asks you to accept its branding as a fixed condition and to provision domains and DNS records by hand for every client, at any scale.

Atriomail's white-label add-on removes the first constraint at any mailbox count, not just above a volume threshold. The step-by-step migration playbook and the WHMCS module remove most of the second, the day-to-day provisioning work. Unlike a reseller rate you'd need to negotiate separately, the Atriomail pricing page shows the whole calculation up front: $1.39/mailbox, 15 GB included, and a margin calculator for whatever resale price fits your market. If mailbox.org is on your shortlist against another bundled-suite option, the Zoho Workplace comparison works through a similar decision from a different angle. Creating an account at system.atriomail.com/admin/register is free and needs no card.

See the 200-mailbox math for your own resale price. Atriomail's wholesale price is $1.39/mailbox with 15 GB included, published for every reseller at any scale, no negotiated rate required.

Work out your margin   Create your account

Frequently Asked Questions

Does mailbox.org offer a wholesale or reseller discount below its published per-user price?

Not that mailbox.org publishes anywhere in its reseller pages or knowledge base. The reseller dashboard lets you set your own resale price, but the rate mailbox.org charges a reseller isn't stated publicly; the only public number is the same retail price a direct customer pays (€4/month Standard, €12/month Premium as of September 2026).

Can I put my own brand on mailbox.org's control panel?

No. mailbox.org's reseller program is built around clients seeing the mailbox.org name and logo at login, on every plan and tier. Its reseller page describes this as a deliberate choice, not a gap that closes at a higher tier.

Does Atriomail have a WHMCS module resellers can use to bill clients automatically?

Yes. The Atriomail WHMCS module (version 3.1.1, built for WHMCS 9) handles Create, Suspend, Unsuspend, Terminate and Change Package. When a client orders an Atriomail product, the module creates their account and email domain, and creates the first mailbox if the domain clears the security check during the order. It's downloaded from the Plugins page in the Atriomail panel and is also searchable on the WHMCS Marketplace as "AtrioMail".

What does Atriomail's white-label add-on actually change?

Once our team configures your branded hostname, which requires you to control DNS for it, the control panel on that hostname shows your product name and favicon, and the help center pages show your logo. Some layers stay neutral or still show the platform, including raw message headers, the webmail interior, payment pages and some platform legal documents. It's a separate paid add-on, a one-time setup fee plus a monthly subscription, with no minimum mailbox count.

Can I migrate a client's mailboxes from mailbox.org to Atriomail?

Atriomail's built-in IMAP migration tool works with any server that accepts IMAP sign-in with a password, and mailbox.org supports standard IMAP. Supply the old mailbox.org IMAP credentials for each account, let the tool copy folders and messages, then cut over DNS when you're ready. The tool moves mail only, not calendars or contacts, and there's no charge for using it.

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