Short answer: MailDeck suits buyers who also want SMTP. Frostmailer includes the .com domain, lets you order a single tenant, delivers in 10 to 24 hours, and adds an API, MCP server and a done-for-you build.
Side by side
| Frostmailer | MailDeck | |
|---|---|---|
| Microsoft / Azure | Yes. €30 per tenant: one .com domain plus 25, 50 or 100 inboxes | Microsoft 365 Outlook tenants from $30 to $40 a month, 100 inboxes each, minimum order 2 tenants |
| Google Workspace | Full admin, €3.00 / €2.80 / €2.50 per inbox by volume | $39 for 10, $99 for 30, $299 for 100 a month |
| Domain included | Yes, a .com with every Azure tenant and with pre-warmed Google. For standard Google Workspace you bring your own | No. You bring your own domains |
| Pre-warmed | Azure €50 per tenant, Google €8 per inbox, 4 weeks of warm-up done | Pre-warmed Outlook at $40 a tenant |
| Done-for-you build | Yes. Build and Release from €1,000 a month: infrastructure, copy, campaign and first month of leads | No |
| API and MCP | REST API and MCP server on every account | Not stated on the site |
| Delivery | 10 to 24 hours | Outlook 2 to 3 business days |
| SMTP | No | Private SMTP from $0.50 an inbox, 100 minimum |
MailDeck details checked on 10 October 2026 from their public pages (sources below). Prices change, so confirm on their site before you buy.
When MailDeck is the better choice
- You also want SMTP inboxes. Frostmailer does not sell SMTP.
- You want pre-warmed Outlook at the lowest price per tenant.
When Frostmailer is the better choice
- You want the domain included rather than bringing your own.
- You want to start with one tenant. MailDeck's minimum is two.
- You want to choose 25, 50 or 100 inboxes per tenant at the same price.
- You want delivery in 10 to 24 hours rather than 2 to 3 business days.
- You want to provision through a REST API or MCP server, or have the whole system built for you.
Questions
Are the prices the same?
Both start around 30 a month per Microsoft tenant. MailDeck's Normal licence is $30 for 100 inboxes, you bring your own domain, and the minimum order is two tenants. Frostmailer's is €30 for 25, 50 or 100 inboxes with the .com domain included, from one tenant.
Does Frostmailer sell SMTP?
No. Frostmailer sells Azure and Google Workspace mailboxes only.
How fast is delivery?
MailDeck's FAQ quotes 2 to 3 business days for Microsoft 365 Outlook inboxes. Frostmailer delivers in 10 to 24 hours.