Freedom251 › Shared Inbox Software
Startup Mail
What Startup Mail is
Startup Mail provides custom-domain email for people, products, and AI agents through a web inbox and developer interfaces. The inbox supports composing, searching, starring, replying, attachments, and delivery-status viewing. Incoming messages can be forwarded to Gmail or Outlook, with replies sent from the company address through a secure relay. Mailboxes may be private or shared, with explicit teammate access for each. Software can connect through scoped API keys, a TypeScript SDK, signed webhooks, and MCP. Setup uses MX records to receive mail and DKIM, SPF, and DMARC records to authenticate sent mail. The included plan allows 1,000 email events per month, and higher-capacity billing is not yet available through self-service. Startup Mail is for requested person-to-person and transactional email; newsletters, promotions, cold outreach, purchased lists, and scraped contacts are disallowed. It does not provide calendars, documents, meetings, chat, storage, device management, or general IMAP, POP, Exchange, or SMTP accounts. The plan costs $1 a month, billed as 12 USD once a year.
Who it suits
Startup Mail suits small companies, products, and AI agents that need email on a custom domain without a full office suite. It also serves developers integrating mail through its API and related tools.
What it does well
- Inbox supports search, attachments, and delivery status.
- Shared mailboxes grant explicit teammate access.
- Forwarding supports Gmail and Outlook.
- Developer access includes API keys, SDK, webhooks, and MCP.
What to know first
- The plan allows 1,000 email events per month.
- Higher-capacity self-service billing is unavailable.
- Forwarding does not sync folders, labels, or read state.
- General IMAP, POP, Exchange, and SMTP accounts are not provided.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| All email features | $12 billed once a year · 1,000 monthly email events · higher-capacity self-service plans not available yet | $1 a month |
As startupmail.dev lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
Startup Mail pairs a web inbox with developer access for custom-domain messaging. Check the monthly event allowance and the limits on forwarding and general mail protocols before adopting it.
Facts from Startup Mail's own pages
- Developer tools
- Software can use scoped API keys, a TypeScript SDK, signed webhooks, and MCP to work with mailboxes. · startupmail.dev, 11 Oct 2026
- Email authentication
- Setup uses MX records to receive mail and DKIM, SPF, and DMARC records to authenticate sent mail. · startupmail.dev, 11 Oct 2026
- Forwarding
- Users can forward incoming mail to Gmail or Outlook and reply from their company address through a secure relay. · startupmail.dev, 11 Oct 2026
- Forwarding limit
- Forwarding does not synchronize IMAP folders, labels, or read state. · startupmail.dev, 11 Oct 2026
- Inbox features
- The web inbox supports composing, searching, starring, replying, attachments, and viewing delivery status. · startupmail.dev, 11 Oct 2026
- Integrations
- The product describes forwarding and secure reply relay with Gmail and Outlook. · startupmail.dev, 11 Oct 2026
- Product limits
- The product does not include calendars, documents, meetings, chat, storage, or device management, and does not provide IMAP, POP, Exchange, or general SMTP accounts. · startupmail.dev, 11 Oct 2026
- Security
- The maker says API, webhook, and MCP access use granted mailbox permissions, and describes tenant and private-mailbox access as remaining in scope for customer-data queries. · startupmail.dev, 11 Oct 2026
- Sending policy
- Startup Mail is for requested person-to-person and transactional email; newsletters, promotions, cold outreach, purchased lists, and scraped contacts are not allowed. · startupmail.dev, 11 Oct 2026
- Support
- The documentation lists [email protected] as the support contact. · startupmail.dev, 11 Oct 2026
- Team access
- Mailboxes can be private or shared, with explicit access for teammates on each mailbox. · startupmail.dev, 11 Oct 2026
- Usage limits
- The included plan allows 1,000 email events per month, and higher-capacity billing is not yet available through self-service. · startupmail.dev, 11 Oct 2026
- What it does
- Startup Mail provides custom-domain email for people, products, and AI agents through a web inbox, API, webhooks, and MCP. · startupmail.dev, 11 Oct 2026
- Who it is for
- The maker describes the service as built for small companies, products, and AI agents that need email on their own domain without a full office suite. · startupmail.dev, 11 Oct 2026
Where Startup Mail stands on Freedom251
- Shared Inbox Software#29 of 30