A client asks for 30 mailboxes, half of them needing more than the default storage, and you want to quote a price before the call ends. That's the moment "$1.39 per mailbox" stops being a headline number and has to turn into an actual monthly figure, with storage blocks, rounding and whatever your own markup is going to be. Atriomail's billing model has exactly two moving parts, mailboxes and storage, but getting the second one wrong is the easiest way to under-quote a client and eat the difference yourself.

This guide walks through precisely how Atriomail charges for mailboxes and storage, what actually shows up on the monthly invoice, and where the panel will show you the real number before you ever commit to a price with a client.

Table of Contents

Key Takeaways

PointDetail
Base price$1.39 per mailbox per month, with 15 GB of storage included in every mailbox
Extra storage$0.60 per additional 5 GB block per month; a partial block still rounds up to a full one
Billing cycleMonthly, with no partial-month charges and no credit for a month already paid
What's never billedDomains, aliases, forwarders and catch-all addresses, once the domain has at least one paid mailbox on it
A deleted mailbox stops the charge; a deactivated one doesn'tAtriomail bills a mailbox until it's actually deleted
What Atriomail does for thisItemizes the exact monthly cost, line by line, on the Subscription page before you ever have to estimate a client quote

Know your exact cost before you quote a client. Atriomail is $1.39 per mailbox per month with 15 GB included; extra storage is $0.60 per 5 GB block. Creating an account is free and needs no card; mailboxes are billed from the first one.

Create a free account   See pricing

Who This Is For

Resellers, agencies and MSPs who already know Atriomail's headline price and need the actual mechanics behind it, specifically how storage overages get priced and rounded, so a client quote holds up once a few mailboxes turn out to need more than the included 15 GB. It assumes you already have, or are about to set up, a client domain on Atriomail; if you haven't onboarded the domain itself yet, the domain management and branding guide covers that step, and the overview of what reseller email hosting involves is a reasonable starting point if this is your first client account.

What You Need Before You Start

  • An Atriomail account. Creating one is free and needs no card; a subscription only starts through Stripe checkout once you create the first mailbox.
  • A rough sense of each client's mailbox count and storage needs. A client who mostly sends and receives text-based mail rarely touches 15 GB; a client with years of attachments or large PDF archives on every mailbox is a different quote entirely.
  • Your own resale price decided, for both mailboxes and storage. Atriomail charges you $1.39 per mailbox and $0.60 per 5 GB block; what you charge the client is entirely yours to set, and the two don't have to use the same markup. The margin calculator on the pricing page is a fast way to test a number before you commit to it on a call.
  • Panel access to the Subscription page, which only shows live, itemized numbers once at least one mailbox exists on the account.

What $1.39 Actually Pays For

Every Atriomail mailbox costs $1.39 per month and comes with 15 GB of storage included. That 15 GB belongs to the individual mailbox, not to the account as a whole: it isn't a pool shared across however many mailboxes a client has, so a client with ten mailboxes gets ten separate 15 GB allowances, not one 150 GB pool to divide however they like. The price and the included storage are both shown at the exact moment you create a mailbox: the panel's Create Email Mailbox screen states "Each mailbox is $1.39/month with 15 GB of storage included, and appears on your next invoice" before you submit, so there's no gap between what the panel tells you and what lands on the bill.

Domains, aliases, forwarders and catch-all addresses are never billed, on top of whatever mailboxes you're already paying for. The one condition is that a domain needs at least one paid mailbox on it before any of those free routing tools can be created, a rule covered in full in the guide to aliases, forwarders and catch-alls. For a reseller pricing out a client book, that means the mailbox count is the only line item that actually drives the quote; a client with 40 mailboxes and a dozen department aliases pays for 40 mailboxes, not 52 line items. The same logic holds at scale: adding mailboxes one at a time or pasting in a 200-line batch through the bulk creation tool doesn't change the per-mailbox price or how it shows up on the invoice, only how fast the mailboxes get created.

See the exact charge before you create the mailbox. Atriomail shows the $1.39 price and the 15 GB included right on the Create Mailbox screen, so there's no guessing what a client's invoice will contain.

Create your account   Read the setup guide

How Extra Storage Is Priced in 5 GB Blocks

Once a mailbox needs more than the included 15 GB, extra storage is sold in 5 GB blocks at $0.60 per block per month, adjustable on each mailbox's own Disk space setting up to a panel maximum of 100 GB. The block pricing rounds up: a mailbox that needs even 1 GB past a block boundary still pays for the full next block, the same as a mailbox that fills it completely. That means an 18 GB mailbox and a 20 GB mailbox cost exactly the same, both one block over the included 15 GB.

Worked out at a few common sizes, using the $1.39 base plus $0.60 per 5 GB block: a 20 GB mailbox is $1.99 a month (15 GB included, one extra block), a 25 GB mailbox is $2.59 (two extra blocks), a 50 GB mailbox is $5.59 (seven extra blocks), and the panel's 100 GB maximum per mailbox is $11.59 (seventeen extra blocks). Extra storage is billed on the size you've set the mailbox to, not on how much mail is actually sitting in it, so raising Disk space to 25 GB "just in case" starts the $2.59 charge immediately, whether the client's mail ever grows into it or not. The panel's Email Mailboxes list shows a Quota column with the current usage against the current limit for exactly this reason, so it's worth checking actual usage before raising a mailbox's size speculatively, a flow the panel's own guide to changing your mailboxes and storage walks through screen by screen.

A mailbox that fills its current storage can't receive new mail until it's freed up or the Disk space setting is raised, which is the other reason to watch usage rather than size the mailbox once and forget it. Getting ahead of it, before a client's mailbox bounces incoming mail, is covered in more depth in the mechanics behind how usage-based email pricing works for resellers, including how the same block pricing applies whether it's one client's one mailbox or a storage-heavy segment of a larger book.

Reading the Subscription Page

The panel's Subscription page itemizes the current monthly cost exactly, broken out by mailboxes, additional 5 GB storage blocks, and aliases, forwarders, catch-alls and domains shown as free, the same breakdown the panel's own How Your Billing and Limits Work article documents. It's a running total of what the account is currently set up to be billed, not an estimate: eight mailboxes at $1.39 each shows as $11.12, and if no mailbox has gone past its included 15 GB, the additional storage line reads $0.00. Nothing on that page requires guesswork, which makes it the fastest way to sanity-check a client quote against what the account will actually be billed before the invoice arrives.

Atriomail panel Subscription Management screen showing itemized mailbox and storage costs, with aliases, forwarders, catch-alls and domains listed as free

The Subscription page's itemized monthly cost, real panel, no mockup: mailboxes billed at $1.39 each, no extra storage blocks purchased, aliases and domains shown as free.

Adding or removing a mailbox, or raising or lowering a mailbox's storage, shows up on the next monthly invoice. There are no partial-month charges for a mailbox added mid-cycle and no credit issued for a month already paid, so a mailbox added on the 20th of the month still bills for the full month on the next invoice, not a partial amount for the days remaining. A mailbox is billed until it's actually deleted: deactivating it, rather than deleting it, doesn't stop the charge, which matters if a reseller is pausing a client's mailbox temporarily rather than closing it out. The Subscription page's Manage Subscription button opens Stripe's own billing portal, where the card on file and past invoices live; payments go through Stripe's checkout directly, so card details never reach Atriomail's own servers.

What This Means for Your Business

Take the standard 200-mailbox client book: at $1.39 per mailbox, that's $278.00 a month wholesale. Billed at $5.00 per mailbox, you collect $1,000.00 from the client and keep $722.00 a month above wholesale, before card fees, support time and any white-label fee. At 200 paid mailboxes white-label branding is included; below 50 it would add $50 a month to the same invoice. That's the baseline every mailbox-only quote in this guide assumes, and it's unaffected by whether any individual mailbox stays within its included 15 GB.

Storage is where a flat per-mailbox quote can quietly stop covering your own costs. Say 20 of those 200 mailboxes genuinely need 25 GB each instead of the included 15 GB: that's two extra blocks per mailbox, 40 blocks total, at $0.60 each, which is $24.00 a month in wholesale cost a flat $5.00-per-mailbox price doesn't automatically account for. It isn't a large number on its own, but it's real margin leaking out of a quote that was priced purely on mailbox count, and it compounds across every storage-heavy client in a book. The fix is simple: decide, for the clients who'll need it, whether you pass that $0.60-per-block cost straight through or mark it up the same way you already do for mailboxes, rather than absorbing it silently. The guide to managing email across several agency clients covers the broader version of this, pricing consistently once a book spans dozens of client domains with different storage profiles. For the margin math itself at other mailbox counts, the guide to flexible email pricing models walks through the same wholesale-to-retail spread at different book sizes.

Work out your own margin on a book this size. Atriomail's wholesale price stays $1.39 per mailbox whether a client's storage needs are light or heavy; the margin calculator on the pricing page works through different mailbox counts and resale prices.

Work out your margin   Talk to the team

Limits to Know

  • No proration, in either direction. A mailbox or storage block added mid-cycle bills for the full month on the next invoice; nothing is credited back for a month already paid.
  • A mailbox is billed until deleted, not until deactivated. Deactivating a mailbox stops it from working; it doesn't stop the charge.
  • 100 GB is the per-mailbox storage maximum in the panel. There's no single unbounded tier past that; a client needing more than 100 GB on one mailbox is outside what a single mailbox can hold.
  • Per-domain caps on total mailbox count or storage aren't set in the panel itself. They're set through the REST API or the WHMCS module only, so a reseller building a self-service portal or billing through WHMCS has that option; one managing accounts by hand in the panel doesn't.
  • There's one published price, not a volume tier. Atriomail doesn't offer a lower per-mailbox rate for larger books or custom enterprise pricing; $1.39 per mailbox is the wholesale price whether the account has five mailboxes or five hundred.
  • Billing questions go through live chat in the panel, during business hours. It isn't a round-the-clock support line, a detail worth setting expectations on with a client support process, as covered in the guide to building one for email resellers.

Frequently Asked Questions

How much does an Atriomail mailbox cost?

$1.39 per month, with 15 GB of storage included. There's no setup fee, no contract and no minimum number of mailboxes to start.

What happens if a mailbox needs more than 15 GB?

Extra storage is sold in 5 GB blocks at $0.60 per block per month, raised from the mailbox's own Disk space setting. A partial block still rounds up to a full block, so a mailbox that's 1 GB over a boundary costs the same as one that fills the whole next block.

Does Atriomail prorate charges when I add or remove mailboxes mid-month?

No. Adding or removing a mailbox, or changing its storage, shows up on the next monthly invoice at the full rate; there are no partial-month charges and no credit for a month already paid.

Can I see exactly what Atriomail will charge before I quote a client?

Yes. The Subscription page in the panel itemizes the current monthly cost by mailboxes and storage blocks, and the pricing page has a margin calculator for working out a client quote against different mailbox counts and resale prices before you commit to a number.

Is there a free trial for Atriomail?

No. Creating an account is free and needs no card, and you can add domains before paying anything, but mailboxes are billed starting from the first one you create.

Can I cap how many mailboxes or how much storage a client's domain uses?

Yes, but not from the panel itself. Per-domain caps on mailbox count and total storage are set through the REST API or the WHMCS provisioning module; a request over the cap is refused, and a cap can't be lowered below what the domain is already using.

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