Business email you own, without the per-mailbox meter.
Email is the most critical system most businesses run, and the one they most often hand entirely to a third party. Microsoft 365 and Google Workspace charge per mailbox every month, store your mail in their cloud under their terms, and make the cost grow with every person you hire. Mailcow is the open source alternative: a complete, modern mail server suite that runs on your own infrastructure with no per-mailbox licensing. Node deploys and manages it as a production service hosted in the UK, handling the deliverability, security and reliability work that makes self-hosted email dependable rather than a liability.
What Mailcow is
Mailcow is an open source email server suite that packages all the components of a complete mail platform into one managed, integrated system. Rather than assembling and maintaining a dozen separate services, you get a coherent platform that covers the entire job of business email.
Postfix and Dovecot handle sending and receiving mail over SMTP and serving it over IMAP. SOGo provides webmail along with shared calendars and contacts, and the CalDAV, CardDAV and ActiveSync protocols that keep phones and desktop clients in sync. Rspamd delivers modern, effective spam filtering, paired with antivirus scanning. A clean web administration interface ties it together for managing domains, mailboxes, aliases and policies.
The result is a full alternative to hosted email suites, with the same day-to-day experience for your users and a fundamentally different ownership and cost model underneath.
Why self-hosted email with Node
No per-mailbox subscription - hosted email charges for every mailbox, every month, forever. Mailcow has no per-mailbox licence. A managed deployment is a predictable cost that does not climb with headcount.
Data residency - your mail, calendars and contacts live on UK or EU infrastructure you control, with a clear answer to where data is stored and who can access it. For regulated sectors and privacy-conscious organisations, that matters.
No lock-in - it is standard IMAP, SMTP and open protocols. Your data is yours, in open formats, and you are never held hostage by a migration that the vendor makes deliberately painful.
Full control - routing rules, retention, aliases, shared mailboxes and policies are configured to how your organisation actually works, not constrained to a provider's tiers.
Deliverability and security, engineered
The reason most organisations do not self-host email is deliverability and security. Both are demanding, and both are what Node manages so you do not have to.
Authentication done right - we configure SPF, DKIM and DMARC correctly for your domains so receiving servers trust your mail and so your domain cannot be easily spoofed.
Reputation management - we manage reverse DNS and sending IP reputation, monitor the major blocklists, and act quickly if an issue arises, keeping your mail out of junk folders.
Spam and malware filtering - Rspamd and antivirus scanning are tuned to catch threats and unwanted mail without losing legitimate messages, with the policy adjusted to your tolerance.
Encryption and access control - TLS for mail in transit, strong authentication for users, and integration with Keycloak for single sign-on so access is governed centrally and leavers lose access immediately.
How Mailcow fits with the rest of your platform
Mailcow sits naturally alongside the rest of the private platform Node manages for you. It complements Nextcloud private cloud to give you a complete, self-hosted alternative to a commercial productivity suite: email, calendars and contacts from Mailcow, files and collaboration from Nextcloud, all on infrastructure you control. We put Proxmox Email Gateway in front of it for an additional layer of anti-spam and anti-virus filtering, and we monitor the whole platform through our Zabbix and Grafana observability stack so queue health, delivery and uptime are watched continuously.
The subscription that never stops growing - per-mailbox email pricing looks small until you multiply it by every employee and every year. It scales with your headcount, not with the value email delivers, and it puts your most critical communications in someone else's cloud. A managed Mailcow platform from Node replaces that recurring per-seat cost with a predictable managed service, keeps your mail on infrastructure you control, and gives you the deliverability and security engineering that makes self-hosted email genuinely dependable.
Talk to us about email hosting.
Drop us a line and our team will discuss your mailbox volumes, deliverability requirements and how a managed Mailcow platform can replace your per-seat email subscription.
Frequently asked questions
What is Mailcow?
Mailcow is an open source email server suite that bundles everything needed to run your own mail platform: Postfix and Dovecot for sending and receiving, SOGo webmail with calendars and contacts, Rspamd for spam filtering, antivirus, and a web admin interface. Node Digital deploys and manages Mailcow as a private email platform for UK organisations.
Is self-hosted email a good alternative to Microsoft 365 or Google Workspace?
For organisations that want data residency, predictable costs and freedom from per-mailbox subscription pricing, yes. Mailcow gives you full-featured business email, calendars and contacts on infrastructure you control. Node runs it as a managed service with the deliverability, security and reliability engineering that self-hosted email requires.
Will email from a self-hosted Mailcow server reach the inbox?
Deliverability is the hard part of self-hosting email, and it is exactly what we manage. We configure SPF, DKIM and DMARC correctly, manage reverse DNS and IP reputation, monitor blocklists and tune the spam engine, so mail from your domain lands reliably rather than in junk folders.
Does Mailcow support calendars, contacts and mobile sync?
Yes. Mailcow includes SOGo, providing webmail, shared calendars and contacts, with CalDAV, CardDAV and ActiveSync so phones, tablets and desktop clients such as Outlook and Apple Mail stay in sync.
Who hosts and supports Mailcow in the UK?
Node Digital runs Mailcow as a production-grade managed service on UK infrastructure or in your own cloud, handling deployment, deliverability, security, upgrades, backups, monitoring and migration from your existing email provider.