Secure Email Hosting — Hardened Mail Servers with Full Protection
Email is the number one attack vector for businesses and individuals alike. Phishing, credential stuffing, man-in-the-middle attacks, and server compromise are daily threats that most email providers handle with minimal defenses. AnubizHost secure email hosting deploys hardened mail servers with multi-layer security: intrusion detection, brute-force protection, advanced spam filtering, malware scanning, and encrypted storage — all included by default.
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Server Hardening and Intrusion Prevention
Every AnubizHost email server is built on a minimal operating system installation with only the packages required for mail delivery. Unnecessary services, ports, and kernel modules are removed or disabled before your server goes live. This reduces the attack surface dramatically compared to general-purpose hosting environments where dozens of unnecessary services run by default.
Fail2ban monitors authentication logs in real time and automatically blocks IP addresses that exhibit brute-force behavior against SMTP, IMAP, POP3, and webmail login endpoints. Rate limiting on all services prevents automated credential-stuffing attacks, and connection throttling stops distributed attacks from overwhelming your server.
The kernel is configured with grsecurity-compatible hardening options including ASLR, stack canaries, and restricted access to kernel pointers. AppArmor profiles confine each mail service to its minimum required permissions, so even if a vulnerability is exploited, the attacker's access is contained to that single process.
Advanced Spam and Malware Filtering
Inbound mail passes through multiple filtering layers before reaching your inbox. SpamAssassin performs content analysis with Bayesian classification, header inspection, and real-time blacklist lookups against dozens of DNSBL providers. ClamAV scans all attachments for known malware signatures, and suspicious attachments are quarantined for review rather than silently dropped.
We implement greylisting to reject spam from poorly configured botnets, SPF validation to detect forged sender addresses, DKIM verification to ensure message integrity, and DMARC policy enforcement to catch sophisticated phishing attempts. These layers work together to block over 99% of spam before it reaches your mailbox.
For organizations with stricter requirements, we support custom filtering rules, allowlists and blocklists, per-user spam sensitivity settings, and integration with third-party threat intelligence feeds. You have full control over how aggressively your server filters and what happens to messages that fail checks.
Authentication and Access Control
Strong authentication is critical for email security. AnubizHost supports SASL authentication with bcrypt password hashing, two-factor authentication via TOTP for webmail login, and client certificate authentication for IMAP and SMTP connections. Passwords are never stored in plaintext or weakly hashed formats.
Access control policies let you restrict email access by IP address, time of day, or geographic location. You can require VPN access for administration, limit IMAP connections to specific network ranges, and enforce password complexity requirements across all accounts. Audit logs track all authentication events with timestamps and source IPs.
For multi-user organizations, role-based access control lets you delegate mailbox management, alias creation, and domain administration without granting full root access. Administrators can manage accounts through a web panel or CLI tools, with all actions logged for accountability.
Monitoring, Updates, and Incident Response
Your secure email server is monitored 24/7 for uptime, resource utilization, mail queue health, and security anomalies. Automated alerts notify our team of unusual patterns such as sudden spikes in outbound mail volume (potential compromise), failed authentication floods (active attack), or disk space exhaustion (possible log flooding attack).
Security updates for the operating system and mail stack are applied automatically within 24 hours of release. Critical vulnerabilities (CVE with CVSS 9+) are patched within 4 hours. You receive notification of all updates applied, and can opt to approve updates manually if you prefer to test them in a staging environment first.
In the event of a security incident, our team follows a structured incident response process: containment, investigation, remediation, and post-incident reporting. You receive a detailed report of what happened, how it was resolved, and what measures were implemented to prevent recurrence. Your data security is not just a feature — it is our operational priority.
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