# Mason: multi-domain email hosting

Email hosting for multiple domains in one workspace. $5/month includes 5 domains, 5 mailboxes per domain, custom signatures, and agent access.

## Pricing

Mason Pro: $5 USD per month, applicable tax included.

- 5 project domains
- 5 private mailboxes per domain
- 5,000 outbound recipient deliveries each month
- Team members included
- Inbox branding and custom signatures
- Folders, labels, filters, and contacts
- Agent access with permissions you choose

Domains are purchased and renewed separately. Your agent provider's service is separate. Cancel through Account settings → Billing; paid access continues to period end. Existing mail remains readable after subscription access ends.

## Requirements and limits

- An email-verified account and active subscription for new setup and sending
- Ownership of each domain and access to its DNS settings
- An agent app with custom MCP and OAuth support for agent access
- Designed for business correspondence, not bulk marketing or unsolicited campaigns
- Domain registration and renewal are purchased separately
- DNS propagation and recipient delivery are not instantaneous or guaranteed
- Each connected agent uses only the approved inboxes and permissions; initial sign-in and consent require the person
- Hosted service capacity and abuse controls also apply

## Questions

### What is multi-domain email hosting?

It lets you send and receive email using several domains you own. Mason keeps those project inboxes in one workspace, so you can switch between them without signing out.

### Do I need to pay for each domain or team member?

No. Mason Pro is $5 USD per month for up to five domains, with five private mailboxes on each. Team members are included. You purchase and renew your domain names separately with your registrar.

### Can I use domains I already own?

Yes. Add your domain, verify ownership, and follow the DNS steps to connect its email. Keep your existing website. Namecheap domains can also use the optional DNS connection.

### Can each project have its own name and signature?

Yes. Give each project an inbox name, logo or monogram, and accent color. Each sending address can have its own sender name and signature, including images, links, and fonts.

### Can my agent use my email?

Yes, when you connect it and approve its permissions. Choose the inboxes and actions it can access, including drafting, sending, organizing mail, and designing signatures. You can revoke access in account settings. Your agent service is separate from your Mason subscription.

### What happens if I cancel?

Cancel through Account settings → Billing. Your paid access continues until the end of the current billing period. After that, sending and new setup require an active subscription; your existing mail remains readable.

## Connect an agent

Use a custom MCP connector at https://mason.red/api/mcp with Streamable HTTP and OAuth. The person signs in and approves inboxes and permissions. Call mason_start after connecting. Full instructions: https://mason.red/llms.txt

## Sources and contact

- [home](https://mason.red/)
- [pricing](https://mason.red/home#pricing)
- [questions](https://mason.red/home#email-questions)
- [signup](https://mason.red/signup)
- [terms](https://mason.red/terms)
- [privacy](https://mason.red/privacy)
- [agentGuide](https://mason.red/agents)
- [agentInstructions](https://mason.red/llms.txt)
- [productMarkdown](https://mason.red/product.md)
- [productJson](https://mason.red/product.json)
- [mcp](https://mason.red/api/mcp)

The Red Collar Company · Pennsylvania, United States
Contact: mason@redcollar.io
Updated: 2026-10-02