0–29 mailboxes: $2.80 / mailbox / month

30–299 mailboxes: $2.50 / mailbox / month

300–999 mailboxes: $0.75 / mailbox / month

1,000+ mailboxes: $0.50 / mailbox / month

Quickest way: on the Home page, click +10, +20 or +50 next to "keep a buffer of email accounts", or Custom for another amount. You can also click Get more at the top of any page.

Or click Packages & Add-ons in the left menu and keep Custom plan selected. On the Maildoso accounts card, click + to choose how many SMTP mailboxes to add (minimum 10). Current value under the counter shows how many you already have, and the card tells you how many more unlock the next, lower rate.

Complete checkout. Your new mailbox allowance is added to your account right away.

Once slots are purchased, mailboxes can also be created via the API or MCP.

Go to Email accounts and click Add more email accounts at the bottom of the list.

At the top, pick the mailbox type: Maildoso (SMTP) or Google — each shows how many you have available. Google can only be used if you already have unused Google Workspace slots. Once you use a domain with Google or Maildoso, it stays linked to that provider.

For each row, enter the First name, Last name and Mailbox name, then choose the domain(s) in the Domain field. You can select several domains in one row, and Apply to all rows copies the domain selection to every row. Use Add new line for more rows.

Click Continue, check the list in Check created mailboxes, and confirm with Register mailboxes.

Wait for the mailboxes to show as Active — usually 30 to 90 minutes; until then they show Setup awaiting or Setup processing. No additional steps are required.

If mailboxes still aren't Active after 90 minutes, check the domain's status on the Domains page — mailboxes only activate once their domain is Active. For an external domain, check that Maildoso's nameservers are set at your registrar; for a domain registered through Maildoso, contact us with the domain name.

Mailboxes can only be created on root domains, not subdomains (name@example.com works, name@sales.example.com doesn't). For more separation, use a separate domain.

Each domain can host up to 99 mailboxes — the Email Accounts column on the Domains page shows how many each domain has (e.g. 4 / 99). Spread mailboxes across domains to limit risk.

You can also create mailboxes from the Domains page: select domains and choose Bulk actions → Create mailboxes.

After provisioning, plan for a two-week warmup (unless the mailboxes are on pre-warmed domains).

To delete mailboxes, select them on the Email accounts page and choose Bulk actions → Delete selected accounts.

If the Home page shows something like "0/30" for Maildoso email accounts, no mailboxes have been created yet — add a domain and create mailboxes; the counter updates as you go.