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Email cost calculator: what several domains of business email cost a year
Price a team's business email across SuperMailOS, Google Workspace, Microsoft 365, Migadu, Purelymail and Proton, from each provider's own pricing pages, checked 14 Oct 2026.
4 min read · 14 Oct 2026 · 6 sections
On this page 6 sections
- What do three common setups cost a year?
- One founder, four products
- A small team on two domains
- An agency with client domains
- Why do the totals differ so much?
- Which published limits matter when you run several domains?
- What does the calculator leave out?
- Where do the numbers come from?
- Questions
- How does the calculator work out a year's price?
- Is SuperMailOS the cheapest option?
- Does adding domains cost more?
- Do aliases like hello@ and support@ cost extra?
- Why aren't Zoho Mail and Fastmail priced?
The yearly bill depends less on how many domains you have than on what each provider counts. Google Workspace and Microsoft 365 charge per user ($7 a user a month on their entry plans), Migadu charges one price per account by how much you send ($19 to $990 a year), Purelymail charges $10 a year, and SuperMailOS charges per mailbox ($3–$6 a month) with aliases free. For 4 people on 2 domains, billed yearly, that is $10 on Purelymail, $90 on Migadu, $144 on SuperMailOS, and $336 on Google Workspace or $336 on Microsoft 365.
Your team
| Provider | Plan | A year | How it adds up |
|---|---|---|---|
| Purelymail | Simple pricing | $10 | One account × $10 a yearNo hard limits; heavy use can mean usage-based pricing |
| Migadu | Mini | $90 | One account × $90 a yearUp to 100 sent and 1,000 received a day; 30 GB for the whole account |
| SuperMailOS | Pro | $144 | 4 mailboxes × $3 a month, billed yearlyAliases free and unlimited, up to 3 domainsEmail only: no office suite |
| Google Workspace | Business Starter | $336 | 4 users × $7 a month (Annual Plan)Includes the suite (Docs, Drive, Meet); 30 GB pooled per user |
| Microsoft 365 | Business Basic | $336 | 4 users × $7 a month (list price)Includes Microsoft's apps and Teams |
| Proton | Workspace Standard | $623.52 | 4 users × $155.88 a yearEnd-to-end encrypted suite; 1 TB per user |
| Zoho Mail | Mail Lite / Mail Premium | Not priced | Per user, billed annually; US-dollar price not verifiedRegional pricing: check Zoho's page for yours |
| Fastmail | Standard or Professional | Not priced | Per user; US-dollar price not verifiedCustom domains need Standard or Professional, not Basic |
US dollars, before tax. Competitor prices from each provider’s own pages (sources below); SuperMailOS prices from our pricing page.
What do three common setups cost a year?
Billed yearly, cheapest first. Each table is the calculator above with these numbers filled in.
One founder, four products
1 person, 4 domains, 12 role addresses, about 20 emails sent a day.
| Provider | Plan | A year | How it adds up |
|---|---|---|---|
| Purelymail | Simple pricing | $10 | One account × $10 a year. No hard limits; heavy use can mean usage-based pricing. |
| Migadu | Micro | $19 | One account × $19 a year. Up to 20 sent and 200 received a day; 5 GB for the whole account. |
| SuperMailOS | Business | $60 | 1 mailbox × $5 a month, billed yearly. Aliases free and unlimited, unlimited domains; Email only: no office suite. |
| Google Workspace | Business Starter | $84 | 1 user × $7 a month (Annual Plan). Includes the suite (Docs, Drive, Meet); 30 GB pooled per user. |
| Microsoft 365 | Business Basic | $84 | 1 user × $7 a month (list price). Includes Microsoft's apps and Teams. |
| Proton | Workspace Standard | $155.88 | 1 user × $155.88 a year. End-to-end encrypted suite; 1 TB per user. |
| Zoho Mail | Mail Lite / Mail Premium | Not priced | Per user, billed annually; US-dollar price not verified. Regional pricing: check Zoho's page for yours. |
| Fastmail | Standard or Professional | Not priced | Per user; US-dollar price not verified. Custom domains need Standard or Professional, not Basic. |
A small team on two domains
4 people, 2 domains, 8 role addresses, about 60 emails sent a day.
| Provider | Plan | A year | How it adds up |
|---|---|---|---|
| Purelymail | Simple pricing | $10 | One account × $10 a year. No hard limits; heavy use can mean usage-based pricing. |
| Migadu | Mini | $90 | One account × $90 a year. Up to 100 sent and 1,000 received a day; 30 GB for the whole account. |
| SuperMailOS | Pro | $144 | 4 mailboxes × $3 a month, billed yearly. Aliases free and unlimited, up to 3 domains; Email only: no office suite. |
| Google Workspace | Business Starter | $336 | 4 users × $7 a month (Annual Plan). Includes the suite (Docs, Drive, Meet); 30 GB pooled per user. |
| Microsoft 365 | Business Basic | $336 | 4 users × $7 a month (list price). Includes Microsoft's apps and Teams. |
| Proton | Workspace Standard | $623.52 | 4 users × $155.88 a year. End-to-end encrypted suite; 1 TB per user. |
| Zoho Mail | Mail Lite / Mail Premium | Not priced | Per user, billed annually; US-dollar price not verified. Regional pricing: check Zoho's page for yours. |
| Fastmail | Standard or Professional | Not priced | Per user; US-dollar price not verified. Custom domains need Standard or Professional, not Basic. |
An agency with client domains
6 people, 12 domains, 40 role addresses, about 150 emails sent a day.
| Provider | Plan | A year | How it adds up |
|---|---|---|---|
| Purelymail | Simple pricing | $10 | One account × $10 a year. No hard limits; heavy use can mean usage-based pricing. |
| Migadu | Standard | $290 | One account × $290 a year. Up to 500 sent and 3,000 received a day; 100 GB for the whole account. |
| SuperMailOS | Business | $360 | 6 mailboxes × $5 a month, billed yearly. Aliases free and unlimited, unlimited domains; Email only: no office suite. |
| Google Workspace | Business Starter | $504 | 6 users × $7 a month (Annual Plan). Includes the suite (Docs, Drive, Meet); 30 GB pooled per user. |
| Microsoft 365 | Business Basic | $504 | 6 users × $7 a month (list price). Includes Microsoft's apps and Teams. |
| Proton | Workspace Standard | $935.28 | 6 users × $155.88 a year. End-to-end encrypted suite; 1 TB per user. |
| Zoho Mail | Mail Lite / Mail Premium | Not priced | Per user, billed annually; US-dollar price not verified. Regional pricing: check Zoho's page for yours. |
| Fastmail | Standard or Professional | Not priced | Per user; US-dollar price not verified. Custom domains need Standard or Professional, not Basic. |
Why do the totals differ so much?
- Per user (Google Workspace, Microsoft 365, Proton). Every person is a license, and each plan comes with a suite: Docs and Drive, Microsoft’s apps and Teams, or Proton’s encrypted Drive and VPN. If your team uses the suite, the price buys more than mail.
- Per mailbox (SuperMailOS). Every person is a mailbox. Aliases and shared access are free, and the plan only changes with the number of domains (Pro up to 3, Business unlimited).
- Per account, by volume (Migadu). One price for the whole account, set by how many messages it sends and receives a day. Many people sending little is cheap; a busy day can push you up a tier.
- Flat (Purelymail). $10 a year with no hard limits on users, domains or storage. Heavy use can move an account to usage-based pricing.
Which published limits matter when you run several domains?
| Provider | Addresses | Domains | Sending |
|---|---|---|---|
| SuperMailOS | Unlimited free aliases | Pro up to 3; Business unlimited | New domains warmed up gradually; a burst of bounces or complaints pauses sending |
| Google Workspace | Up to 30 aliases per user; more needs another Google account | Up to 600 | — |
| Microsoft 365 | Up to 400 aliases per user; shared mailboxes free up to 50 GB | Typically up to 5,000 | — |
| Migadu | Unlimited | Unlimited (Micro: “almost unlimited”) | Micro 20, Mini 100, Standard 500, Maxi 2,000 a day |
| Purelymail | No hard limits | No hard limits | No hard limits |
| Proton (Workspace Standard) | 20 per user | 15 custom domains | — |
| Zoho Mail (Forever Free) | — | 1 domain, up to 5 users | — |
A dash means the provider’s pages we checked don’t state that limit.
What does the calculator leave out?
- The suites. Google, Microsoft and Proton prices include apps and storage that SuperMailOS doesn’t sell. If you’d use them, compare on more than mail.
- Zoho Mail and Fastmail prices in US dollars. Their pages showed us regional prices, so they appear as “Not priced” with the facts we could read.
- Tax, discounts and promotions. Every price is a list price before tax.
- Sending limits at per-user providers. They aren’t part of the pricing pages we checked, so they don’t change these totals.
Where do the numbers come from?
Each competitor fact was read on that provider’s own pages on the date shown. SuperMailOS’s prices are on our pricing page.
Google Workspace facts from Google Workspace’s own pages: Google Workspace pricing, Google Workspace pricing, Google: email aliases, Google: multiple domains · checked 14 Oct 2026
Microsoft 365 facts from Microsoft 365’s own pages: Microsoft 365 pricing, Microsoft: email aliases, Microsoft: shared mailboxes, Microsoft: domains FAQ · checked 14 Oct 2026
Migadu facts from Migadu’s own pages: Migadu pricing · checked 14 Oct 2026
Purelymail facts from Purelymail’s own pages: Purelymail pricing · checked 14 Oct 2026
Proton facts from Proton’s own pages: Proton pricing · checked 14 Oct 2026
Zoho Mail facts from Zoho Mail’s own pages: Zoho Mail pricing · checked 14 Oct 2026
Fastmail facts from Fastmail’s own pages: Fastmail pricing · checked 14 Oct 2026
Questions
How does the calculator work out a year's price?
Per-user providers (Google Workspace, Microsoft 365, Proton) are people × the monthly price × 12. SuperMailOS is mailboxes × its monthly price × 12, on the cheapest plan that covers your domains. Migadu is one account on the cheapest tier whose daily sending limit covers you. Purelymail is $10 a year. Zoho Mail counts as free only when its Forever Free plan covers the team (up to 5 users on 1 domain).
Is SuperMailOS the cheapest option?
No. For most small teams Purelymail ($10 a year) and Migadu (from $19 a year) cost less, and Zoho's Forever Free plan costs nothing for up to 5 users on one domain. SuperMailOS usually costs less than Google Workspace, Microsoft 365 and Proton for email-only use. What it sells is every domain in one inbox, per-person pricing with free aliases, and the DNS and deliverability setup done for you.
Does adding domains cost more?
Not on Google Workspace or Microsoft 365, whose prices are per user (Google allows up to 600 domains, Microsoft typically up to 5,000), nor on Migadu or Purelymail. On SuperMailOS, Pro covers up to 3 domains and Business is unlimited, so a fourth domain moves you from $3 to $5 a mailbox a month, billed yearly.
Do aliases like hello@ and support@ cost extra?
Not on SuperMailOS (unlimited, every domain), Microsoft 365 (up to 400 per user, no fee) or Migadu (unlimited). Google Workspace includes up to 30 per user; past that, Google says you need another Google account. Proton's Workspace plans include 20 addresses per user.
Why aren't Zoho Mail and Fastmail priced?
Their pricing pages showed us regional prices, not US dollars, and we don't convert or estimate a price we couldn't read. Both are listed with what their pages do say: Zoho's Forever Free limits, and Fastmail's custom domains starting on its Standard plan.