Software
Self-Hosted Webmail Client: MailFlow Brings a Modern Inbox to Your Existing Mail Server
Your mail server probably works fine. The problem is what users see when they log in. Many hosting panels still ship webmail that looks like it was designed fifteen years ago. Users complain, forward everything to a personal Gmail account, and your business email loses the professional edge it was meant to give. A self-hosted webmail client lets you replace that dated interface without touching the mail server underneath. MailFlow, from Sysfo Software Solutions, is a Gmail-style webmail client for the mail server you already run. There is no migration and no new mailboxes.
Your mail server probably works fine. The problem is what users see when they log in. Many hosting panels still ship webmail that looks like it was designed fifteen years ago. Users complain, forward everything to a personal Gmail account, and your business email loses the professional edge it was meant to give.
A self-hosted webmail client lets you replace that dated interface without touching the mail server underneath. MailFlow, from Sysfo Software Solutions, is a Gmail-style webmail client for the mail server you already run. There is no migration and no new mailboxes.
What MailFlow is (and isn't)
MailFlow is a front end. It connects to any standards-compliant IMAP, POP3 and SMTP server and shows mail in a fast, modern interface. It is not a new mail server, so your mailboxes, DNS records and deliverability stay exactly where they are.
One important design choice: MailFlow stores zero emails in its own database. Mail is streamed live from your server and never copied. The database holds only settings.
Who it is built for
- Hosting providers and resellers who want to replace panel webmail and white-label it for each client domain
- Businesses that want full data ownership and an inbox their staff can use without training
- IT teams running mail on cPanel, Plesk, Exchange (IMAP), hMailServer or Linux mail stacks
Features users notice
Real-time inbox. New mail appears instantly through IMAP IDLE, with optional desktop notifications.
Familiar three-pane layout. Folders with drag-and-drop, bulk actions (read, star, archive, spam, move, delete), server-side and advanced search, pop-out windows and a quota meter.
Safe reading. HTML mail is sanitised and sandboxed, and remote trackers are blocked. Attachments can be previewed or downloaded, and you can view headers or save a message as .eml.
A proper composer. Rich text, signatures, templates, schedule send, priority flags, read receipts, clean reply quoting and recipient autocomplete.
Address book. Searchable contacts with one-click compose.
Themes and mobile. Light, Dark and Glass themes saved per user, a responsive layout for phones and tablets, and keyboard shortcuts.
18 interface languages, including 9 Indian languages.
Features admins love
Per-domain branding. Each client domain gets its own name, logo, colours and support email from one installation. That is true white-label webmail.
User and session control. Promote admins, disable accounts and sign users out across devices. Users can connect multiple mailboxes.
Three-step setup wizard. Users enter their email address, MailFlow auto-detects hosts, ports and encryption, then runs a live connection test before saving.
Compatibility
Works with | Notes |
|---|---|
cPanel, Plesk, DirectAdmin | Popular hosting panels |
CyberPanel, HestiaCP | Open-source panels |
hMailServer, Exchange (IMAP) | Windows mail servers |
Dovecot, Postfix, Courier | Linux mail stacks |
Sysfo HostConsole | Runs on the same server |
Connections use SSL/TLS or STARTTLS.
Security
- Mail passwords encrypted with AES-256-GCM
- App passwords hashed with BCrypt
- Short-lived in-memory tokens with rotating httpOnly refresh cookies and reuse detection
- Rate limiting and security headers
Installation options
- Windows Server with IIS: a double-click installer sets up IIS and SQL Server Express, runs MailFlow as a Windows Service and configures the reverse proxy automatically.
- Docker: for Linux and container-based setups.
- Beside your hosting panel: MailFlow can run on the same server and connect to mail over localhost.
The stack is ASP.NET 8, MailKit, EF Core, React 18, TypeScript and Tailwind.
MailFlow vs typical panel webmail
Typical panel webmail | MailFlow | |
|---|---|---|
Look and feel | Dated | Gmail-style, 3 themes |
Real-time push | Often polling | IMAP IDLE |
White-label per domain | Limited | Yes, from one install |
Languages | Few | 18, including 9 Indian |
Mail stored in app DB | Varies | Never |
Mobile layout | Basic | Fully responsive |
A natural pair with HostConsole
If you run Windows hosting, HostConsole manages sites, DNS, SSL and mailboxes, and MailFlow gives your customers a modern inbox. Sysfo also offers managed web hosting services.
Getting started
Sysfo offers a free live demo, then a branded trial build with your domain, name, logo and colours, and finally a go-live installation beside your existing mail server.
Frequently asked questions
Do I need to migrate mail? No. MailFlow works with any standards-compliant IMAP/POP3/SMTP server.
Can each domain have its own branding? Yes, from a single installation.
Is my email stored by MailFlow? No. Mail is streamed live from your server. Only settings are stored.
How does real-time delivery work? Through IMAP IDLE and Server-Sent Events.
How is it installed? With a Windows installer or Docker.
Give your users an inbox they enjoy
See MailFlow with your own domain branding. Book a free demo or request a quote, or contact Sysfo on +91 76074 20009.
