IceWarp is not a name most MSPs encounter first, but it appears when a small hosting provider or IT shop goes looking for something purpose-built for service providers. The company positions IceWarp as an email and collaboration platform for ISPs, hosting companies and enterprises, with a cloud version partners can resell. There is a WHMCS integration listed on the partner program page, pricing tiers denominated in euros, and a mention of white-label branding. On the surface, it looks like a direct alternative to Atriomail for a reseller who wants a vendor with their own program.

The details are less straightforward. IceWarp's most affordable cloud plan includes 2 GB of email storage per user -- that is thin for a professional mailbox in 2026. White-label branding requires the Silver partner tier, which has a minimum of 1,000 paid users. And the wholesale pricing that makes the economics work only unlocks at volume thresholds that most 20-200 mailbox MSPs never reach. This post works through what a reseller at that scale actually gets, where IceWarp genuinely makes sense, and how the comparison lands against Atriomail on the dimensions that matter for day-to-day operation.

Table of Contents

Key Takeaways

Point Details
IceWarp Core includes 2 GB email storage per user At $1.35/user/month (annual, icewarp.com September 2026), the entry plan leaves 2 GB for email -- tight for any business mailbox used actively throughout the month.
White-label requires Silver tier: 1,000 users minimum Below that threshold, clients who sign in to IceWarp see IceWarp branding regardless of what the MSP calls the service.
Bronze wholesale starts at roughly $0.33/user/month Lower per-user than Atriomail's $1.39/mailbox, but corresponds to Core plan storage (2 GB email) and carries no white-label or priority support.
Atriomail includes 15 GB per mailbox at $1.39/month from the first account No minimum mailbox count, no annual commitment, and the WHMCS module handles Create, Suspend, Unsuspend, Terminate and Change Package from day one.
DNS automation works on Cloudflare and Namecheap with Atriomail; IceWarp DNS is manual For MSPs with domains at either provider, Atriomail publishes MX, SPF, DKIM and DMARC records without manual copying. IceWarp requires the reseller to add records at each DNS host.

Compare the per-mailbox numbers directly. Atriomail charges $1.39/mailbox/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.

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What IceWarp Is and Who Buys It

IceWarp started as a Windows mail server in the late 1990s and has expanded into a platform that bundles email, calendar, contacts, tasks, team chat, video conferencing, document editing and file storage. It ships as both a cloud-hosted service and an on-premises installation, giving it staying power with ISPs, hosting companies and enterprise IT departments. The company's marketing addresses service providers directly, which is what puts it in the same shortlist as Atriomail when a hosting reseller goes looking for an email platform with a partner program.

For a reseller who wants to avoid running servers, the relevant product is IceWarp Cloud: IceWarp hosts the infrastructure and partners resell access. The partner program has four tiers (Authorized, Silver, Gold, Platinum). The pricing and benefits on each tier scale with the number of users managed. Authorized (Bronze) has no minimum user commitment and is the starting point for a new reseller. The retail pricing for end users, as listed on icewarp.com in September 2026, is as follows:

Plan Price (annual subscription) Email storage Total storage
Core $1.35/user/month 2 GB 4 GB
Essential $2.25/user/month 50 GB 1 TB
Business $4.05/user/month 200 GB 1 TB

Bronze partners pay a wholesale rate starting from approximately $0.33/user/month (€0.30 at September 2026 EUR/USD rates, from IceWarp's hosting partner page). The partner marks that up and bills clients at whatever price they choose. If a client wants an integrated suite rather than email alone, IceWarp has calendar, contacts and collaboration tools that a pure email host does not. For context on similar ISP-scale platforms, see our Zimbra overview for MSPs and the MDaemon self-hosted vs managed hosting analysis.

The Storage Numbers at Entry Price

The most immediate comparison is what each platform gives a client at the closest price point. IceWarp Core runs $1.35/user/month and includes 2 GB of email storage per user. Atriomail runs $1.39/mailbox/month and includes 15 GB per mailbox. The monthly cost is nearly identical; the included storage is not. Two gigabytes fills quickly for any business that receives attachments, keeps a sent folder or stores older correspondence. An active user can accumulate 1-2 GB within a single month, and anyone working for a client who routinely receives PDFs, invoices or design files will hit the limit within weeks of onboarding.

The migration step is also part of the picture. As covered in the agency playbook for email migrations, the destination mailbox needs enough room to receive the existing mail history before the DNS cutover. A 2 GB destination for a client with three years of saved email is a problem before the new platform goes live.

To reach storage that competes with what business clients expect, a reseller would move to IceWarp Essential ($2.25/user/month, 50 GB email storage) or IceWarp Business ($4.05/user/month, 200 GB). At Essential pricing, a 200-mailbox book costs $450/month at retail (200 x $2.25); the Bronze wholesale rate for tiers above Core is not published on IceWarp's public pages. At Atriomail's $1.39/mailbox, the same 200-mailbox book costs $278/month wholesale -- $172/month less, with 15 GB already included. The per-mailbox pricing model explained walks through how Atriomail's block-based extra storage compares to jumping between tier-priced plans when client storage needs grow.

Fifteen gigabytes included per mailbox, no tier jump required. Extra storage at Atriomail adds $0.60 per 5 GB block per mailbox per month -- scale individual mailboxes as clients need it, without upgrading the whole account to a new plan.

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White-Label and the 1,000-User Threshold

White-label branding -- the control panel showing your product name rather than the underlying platform's -- is listed on IceWarp's partner page as available from Silver tier. Silver requires a minimum of 1,000 paid users. For a reseller managing 200 client mailboxes, that threshold is five times the size of the entire book. At Bronze tier, clients who sign in to the IceWarp panel see IceWarp branding, no matter what the MSP calls the service in their own proposals.

This matters more for some MSPs than others. If the selling point is a feature-rich collaboration suite and clients understand they are using a named platform, visible vendor branding may not be a concern. But if the MSP is positioning email as part of its own managed service -- billed on the MSP's invoice, presented as the MSP's product -- having IceWarp's name in the control panel creates friction at every support interaction. What white-label email actually covers and what it does not is a question worth working through before deciding how important branding is to the specific client relationships involved.

Atriomail's white-label add-on has no minimum mailbox count. It is a paid add-on -- a one-time setup fee plus a monthly subscription -- and it requires the MSP to control DNS for their branded hostname so our team can configure it. The honest answer to what it covers: on your hostname, the control panel shows your product name and favicon, and the help center pages show your logo. Some layers stay neutral, including raw message headers, the webmail interior, payment pages and some platform legal documents. The email branding guide for resellers covers how to position the service to clients once the panel carries your name.

On IceWarp's side, the Silver tier also unlocks a wholesale pricing step: from Bronze's €0.30/user to Silver's €0.20/user. White-label access and the lower wholesale rate arrive at the same 1,000-user threshold. For a reseller with 200 mailboxes, neither benefit applies.

WHMCS, DNS Setup, and Client Migration

IceWarp's hosting partner page describes a WHMCS integration covering automated billing, provisioning and lifecycle management. The specific lifecycle actions supported are not listed in public documentation; what "provisioning" and "lifecycle management" include in practice would need to be confirmed with IceWarp's partner team before building a WHMCS workflow around the module. For a reseller already running email billing through WHMCS, the multi-client email management guide for agencies covers what to expect from a properly integrated provisioning module and what gaps create support work.

Atriomail's WHMCS module (version 3.1.1, WHMCS 9) has a documented set of service actions: Create, Suspend, Unsuspend, Terminate and Change Package. When a client orders an Atriomail product in WHMCS, the module creates the client's account and email domain, and creates the first mailbox if the domain passes the security check. Mailboxes and storage clients add through the WHMCS client area bill as recurring charges at the reseller's retail price. The module is available from the Plugins page in the Atriomail panel and is also searchable on the WHMCS Marketplace as "AtrioMail".

On DNS, IceWarp requires manual record setup per domain at each DNS host. Atriomail automates this for Cloudflare and Namecheap: once either provider is connected and the domain is imported, adding the domain publishes MX, SPF, DKIM and DMARC without manual copying. For all other DNS hosts, Atriomail's DNS Setup dialog lists the records with copy buttons. The guide to connecting Cloudflare and Namecheap for automatic mail DNS covers why the import sequence matters and what a "DNS Automation Pending" status means.

For client migration, Atriomail's built-in IMAP migration tool copies mail from any server that accepts IMAP sign-in with a password -- typical cPanel, Plesk and DirectAdmin hosting mail, Gmail and Google Workspace with an app password, and Yahoo and iCloud with app-specific passwords. The tool keeps folder structure and original message dates. It moves mail only, not calendars or contacts. IceWarp's public documentation does not describe a built-in migration tool for incoming moves; clients moving to IceWarp from another host would use a third-party IMAP migration tool.

IceWarp vs Atriomail for Resellers

Dimension IceWarp Atriomail
Wholesale price (small MSP) From €0.30/user/month (Bronze, no minimum; IceWarp hosting partner page, September 2026) $1.39/mailbox/month (any scale)
Included email storage 2 GB per user (Core plan, icewarp.com September 2026) 15 GB per mailbox
Extra storage Upgrade to Essential ($2.25/user, 50 GB email) or Business ($4.05/user, 200 GB); Bronze wholesale for upper tiers not published $0.60 per 5 GB block per mailbox per month; billed on size set, not usage
WHMCS module Integration listed as covering automated billing, provisioning and lifecycle management; specific actions not documented publicly (IceWarp partner page, September 2026) v3.1.1 (WHMCS 9): Create, Suspend, Unsuspend, Terminate, Change Package
White-label branding Silver tier only (1,000 users minimum; IceWarp partner page, September 2026) Paid add-on (one-time setup fee plus monthly subscription); no minimum mailbox count
DNS automation Manual record setup per domain at each DNS host Automatic on Cloudflare and Namecheap; copy records from DNS Setup dialog elsewhere
IMAP migration tool Not offered; use any standard IMAP migration tool Built-in, no charge; copies mail only, not calendars or contacts
Contract / commitment Annual subscription (retail pricing, icewarp.com September 2026) Monthly billing, no long-term contract
Support hours 24/7 ticketing at Silver+ (1,000 users); not specified for Bronze Business hours

When IceWarp Makes Sense

IceWarp is a capable platform with a clear market. Several situations make it the better choice:

  • Volume reaches Silver tier. At 1,000 or more users, wholesale pricing drops to €0.20/user, white-label becomes available, and 24/7 ticketing support is included. An ISP managing thousands of mailboxes across many organizations is the design target for this program.
  • Clients need an integrated suite, not email alone. IceWarp bundles calendar, contacts, tasks, team chat, video conferencing, document editing and file storage. For a client who wants a self-contained collaboration environment and is not already on Google Workspace or Microsoft 365, IceWarp's breadth has real value an email-only host cannot match.
  • Migrating an existing IceWarp on-premises deployment. MSPs already running IceWarp mail servers for clients may find the managed cloud path a natural next step, since admin tooling and client experience carry over.
  • Regional presence matters. IceWarp has an established partner network in Central and Eastern Europe, Latin America and parts of Asia, where local support access and partnerships may weigh in its favor.

Why Resellers Choose Atriomail

For a reseller managing 20-200 client domains through WHMCS, the practical questions are: what does a mailbox actually cost me, can I put my name on this service without hitting a volume threshold, and can I onboard a client without a manual DNS setup and migration process?

On cost at the 200-mailbox scale, Atriomail's wholesale is $278/month (200 x $1.39) with 15 GB per mailbox included. IceWarp Essential -- the plan with storage that business clients can actually use -- runs $450/month at retail (200 x $2.25); the Bronze wholesale rate for that tier is not published. At $5/mailbox billed, the Atriomail margin is $722/month before card fees, support time and any white-label fee. The Atriomail pricing page includes a margin calculator for any resale price. You set your own price; Atriomail charges you $1.39 per mailbox and does not dictate what you charge clients.

On white-label, Atriomail does not require a minimum mailbox count. The paid add-on is available as soon as the reseller controls a hostname they want to brand. That is a meaningful difference from a 1,000-user threshold a 200-mailbox book does not reach. The DNS and deliverability guide for Atriomail resellers covers how SPF, DKIM and DMARC are configured per domain once clients go live.

DNS automation on Cloudflare and Namecheap means adding a domain publishes the mail records without manual copying. The built-in IMAP migration tool handles the cutover for clients moving from cPanel, Plesk, DirectAdmin hosting or Google Workspace. Billing is monthly with no long-term contract. Creating an account at system.atriomail.com/admin/register is free and needs no card; a WHMCS admin can download the module from the Plugins page and run a test connection before committing any client domain.

Planning to move 50 or more mailboxes to Atriomail? Bulk migration needs each account's own IMAP password, and larger books benefit from coordinating the sequence with us before you start. Reach us through the contact page.

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Frequently Asked Questions

Does IceWarp have a WHMCS module?

IceWarp describes WHMCS integration on its hosting partner page as covering automated billing, provisioning and lifecycle management. The specific service actions the module supports are not listed in public documentation. For the exact scope, contact IceWarp's partner team directly before building a provisioning workflow around it.

Can Atriomail's WHMCS module provision a client domain and mailbox automatically?

Yes. When a client orders an Atriomail product in WHMCS, the module creates the client's Atriomail account and email domain, and creates the first mailbox if the domain passes the security check during the order. The module handles Create, Suspend, Unsuspend, Terminate and Change Package as defined service actions. It requires WHMCS 9, and the product must be configured as a Hosting Account or Reseller Account type.

Does Atriomail offer white-label at any mailbox count?

Yes. The white-label add-on -- a one-time setup fee plus a monthly subscription -- is available at any scale, with no minimum mailbox count. Once our team configures the branded hostname (you need 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, including raw message headers, the webmail interior and some platform legal documents.

What storage does Atriomail include per mailbox, and how does extra storage work?

Each mailbox includes 15 GB. Extra storage is sold in 5 GB blocks at $0.60 per block per month, billed on the quota size you set rather than how much mail is actually stored. A 25 GB mailbox costs $1.99/month; a 50 GB mailbox costs $3.19/month.

Can I migrate client mailboxes from an IceWarp server to Atriomail?

Atriomail's built-in IMAP migration tool works with any server that accepts IMAP sign-in with a password. IceWarp mail servers support standard IMAP, so the migration process is the same as moving mail from a cPanel or Plesk server: supply the old IMAP credentials for each mailbox, let the tool copy folders and messages, then cut over DNS when ready. The tool moves mail only, not calendars or contacts.

Is there a minimum commitment with Atriomail?

No minimum mailbox count and no long-term contract. Billing is monthly and starts when the first mailbox is created. There are no partial-month charges and no credit for a month already paid. A mailbox is billed until it is deleted; deactivating it does not stop the charge.

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