Self-Hosting GDPR-Compliant Club Email Mailboxes with Virtualmin: How to Set Up Roundcube, Spam Filters, and Encrypted Backups for Privacy-Safe Member Communication

Why Your Club Should Pay Attention to GDPR-Compliant Email Communication

Communication with members via email is an essential part of club life. However, since the GDPR, clubs must ensure that personal data – such as email addresses and content – is protected. Public email services or insecure servers endanger your members' privacy. A self-hosted solution with Virtualmin gives you full control and enables privacy-safe member communication.

In this article, we show you how to set up Virtualmin GDPR-compliant email mailboxes for your club. We cover the installation of Roundcube as a webmail client, the configuration of spam filters, and the setup of encrypted backups. This way, you retain data sovereignty and meet GDPR requirements.

Step 1: Install Virtualmin and Basic Configuration

Virtualmin is a powerful open-source control panel for managing web servers, domains, and email accounts. To operate it, you need a virtual server or a dedicated server. Make sure the server is located in Germany or an EU country to facilitate GDPR compliance.

After installing Virtualmin (e.g., on Ubuntu 22.04), first set up a domain for your club. Register a suitable domain via Dezhost Domains and point it to your server. In Virtualmin, create a new virtual system with this domain.

Enable Email Functions

Virtualmin comes with all necessary services by default: Postfix as MTA, Dovecot as IMAP/POP3 server, and MySQL for the database. Ensure these services are enabled and up to date. In Virtualmin's system settings, you can enable email functions for your domain and create mailboxes for your members.

Step 2: Set Up Roundcube as a Webmail Client

Roundcube is a user-friendly webmail client that integrates seamlessly with Virtualmin. It allows your members to access their emails via browser without installing local email software. This is especially practical for less tech-savvy members.

Roundcube is installed in Virtualmin via the Virtualmin Mail plugin or manually. After installation, you can enable Roundcube for each domain. Don't forget to set up a valid SSL certificate (e.g., Let's Encrypt) so the connection is encrypted. This ensures that login credentials and email content cannot be intercepted.

Security Settings for Roundcube

• Enable two-factor authentication for webmail access if possible.
• Enforce a strong password policy for all mailboxes.
• Restrict access to Roundcube to trusted IP addresses if desired.
• Keep Roundcube and all plugins regularly updated to close security gaps.

Step 3: Configure Spam Filters

Spam is not only annoying but can also contain malware. For GDPR-compliant operation, it is important that spam is reliably filtered to prevent malware delivery and conserve system resources. Virtualmin supports you with SpamAssassin and ClamAV.

Install SpamAssassin and ClamAV via the Virtualmin interface or package manager. Then configure spam filtering for your domain. You can adjust the sensitivity and specify whether spam should be marked, moved to a junk folder, or deleted directly. For clubs, marking and moving to the junk folder is recommended so that no legitimate emails are lost.

Additional Measures Against Spam

• Set up SPF, DKIM, and DMARC records for your domain to increase the authenticity of your emails.
• Enable greylisting to ward off spam bots.
• Use RBLs (Realtime Blackhole Lists) to block known spam sources.
• Train your members in handling suspicious emails.

Step 4: Set Up Encrypted Backups

Backups are essential to avoid data loss. The GDPR also requires that personal data be stored encrypted. Virtualmin offers integrated backup functions that you can use for encrypted backups.

Set up a scheduled backup job in Virtualmin that regularly backs up all email data. Choose an external storage location (e.g., a NAS or cloud storage) as the target and enable encryption. Virtualmin supports encryption with GPG or OpenSSL. Keep the encryption key safe – without it, the backups are useless.

Best Practices for Backups

• Create daily incremental backups and weekly full backups.
• Test restoration regularly to ensure the backups work.
• Store a copy of the backups off-site to protect them from physical damage.
• Document the backup process and restoration steps for emergencies.

Conclusion: Privacy and Control for Your Club

With Virtualmin, you can build a GDPR-compliant email infrastructure for your club. You retain full control over your members' data and can ensure that no unauthorized access occurs. The combination of Roundcube, spam filters, and encrypted backups provides a solid foundation for secure member communication.

To implement this, you only need a suitable server. If you are still looking, Dezhost offers web hosting or virtual servers that are ideal for this project. If you have any questions, our support is happy to help.