Mail Server

Managed email hosting for your domains

Host email on your own server with managed Stalwart. Full SMTP/IMAP with DKIM, SPF, DMARC auto-configuration, mailboxes, aliases, and deliverability monitoring.

Get Started Documentation

Everything you need for self-hosted email

Production-grade email hosting without the complexity of configuring Postfix, Dovecot, and OpenDKIM yourself.

Full Mailbox Hosting

SMTP, IMAP, and POP3 for any domain you own. Works with Thunderbird, Apple Mail, Outlook, and any standard email client.

DKIM, SPF & DMARC

Automatic DKIM key generation and signing. SPF and DMARC record generation with copy buttons. One-click Cloudflare auto-configure.

Mailboxes & Aliases

Create unlimited mailboxes with custom quotas. Set up aliases, catch-all addresses, and discard rules per domain.

DNS Setup Wizard

4-step wizard generates all required DNS records (MX, SPF, DKIM, DMARC). Verify propagation inline. Cloudflare users get auto-configuration.

Encrypted at Rest

DKIM private keys and admin credentials encrypted with AES-256-GCM. Decrypted only when needed, never logged.

Deliverability Monitor

Real-time SPF, DKIM, DMARC, and PTR record verification. Know exactly what is preventing your email from reaching inboxes.

How It Works

01

Create Mail Server

Click "Create Mail Server" in the sh0 dashboard. Enter a name and your primary email domain.

02

Configure DNS Records

Follow the 4-step DNS wizard. Copy MX, SPF, DKIM, and DMARC records to your DNS provider -- or auto-configure with Cloudflare.

03

Create Mailboxes

Add mailboxes for your users with custom passwords and storage quotas. Set up aliases and catch-all addresses.

04

Connect Your Client

Configure any email client with the provided SMTP/IMAP settings. Auto-SSL certificates are already provisioned.

DNS Auto-Configuration Flow

Create Mail Server
Generate DKIM Keys
DNS Wizard
Verify Records
Ready to Send

Cloudflare users skip the manual step -- sh0 configures DNS records automatically via API.

Standard protocols, any email client

Works with every email client. No proprietary protocols, no lock-in.

SMTP

Outgoing mail

Port 587 STARTTLS

IMAP

Incoming mail (synced)

Port 993 SSL/TLS

POP3

Incoming mail (download)

Port 995 SSL/TLS

Email client configuration

# Incoming (IMAP)
Server: mail.yourdomain.com
Port: 993
Security: SSL/TLS
Username: [email protected]
# Outgoing (SMTP)
Server: mail.yourdomain.com
Port: 587
Security: STARTTLS
Username: [email protected]

External Email Providers

  • x Per-user monthly fees ($6-12/user)
  • x Your email data on someone else's servers
  • x Vendor lock-in with proprietary features
  • x Storage limits per mailbox
  • x Limited admin control and customization
  • x Compliance complexity with data jurisdiction

sh0 + Stalwart

  • Flat pricing, unlimited mailboxes
  • Email data stays on your server
  • Standard protocols, works with any client
  • Storage limited only by your disk
  • Full admin control, DKIM/SPF/DMARC wizard
  • Your server, your jurisdiction

Frequently Asked Questions

Which mail server engine does sh0 use? +
Stalwart Mail Server -- a modern, high-performance mail server written in Rust. It supports SMTP, IMAP, POP3, JMAP, and ManageSieve out of the box.
Can I host email for multiple domains? +
Yes. Each mail server instance supports multiple domains. Add domains in the dashboard and configure their DNS records independently.
Will my emails land in spam? +
sh0 generates proper DKIM, SPF, and DMARC records and monitors their status. Combined with a clean server IP and correct PTR record, your deliverability will be excellent.
Do I need a Cloudflare account? +
No. The DNS wizard works with any DNS provider -- you copy the records manually. Cloudflare users get an optional one-click auto-configure feature.
How much storage does each mailbox get? +
You set the quota per mailbox. Storage is limited only by your server disk space.
Can I migrate from Gmail / Outlook / existing IMAP? +
Yes. Use any IMAP migration tool (like imapsync) to transfer existing mailboxes to your sh0 mail server.

Stop paying for email hosting

Host email on your own server. Full control, full privacy, zero per-user fees.

Get Started Read the Docs