Block spam by what it says, not just where it comes from.
Source-based filtering misses spam from new and compromised legitimate servers. IP Four deploys content and keyword filtering that catches spam based on what the message actually contains, regardless of where it originates.
Content filtering that catches what source filters miss.
From keyword detection to HTML analysis, content filtering adds a critical layer that catches spam regardless of where it originates.
Keyword and Phrase Detection
Custom keyword lists and phrase patterns configured to match your organisation's spam and policy requirements. Exact match, wildcard, and regular expression patterns all supported.
HTML and Body Content Analysis
Full message body and HTML structure analysed for spam indicators. Hidden text, obfuscated content, and HTML tricks used by spammers to evade simple keyword checks are all detected.
URL and Link Content Checking
Links embedded in email bodies are checked against URL reputation databases and analysed for suspicious patterns. Shortened URLs are expanded and checked before delivery.
Policy-Based Content Rules
Organisation-wide content policies enforced at the email gateway. Rules covering regulatory compliance, acceptable use, and data protection requirements applied consistently across all users.
Sensitivity and Scoring Controls
Content filter sensitivity configurable per rule, per department, and per user. Scoring thresholds set to balance spam catch rates against false positive risk for different business contexts.
Content Filter Reporting
Dashboards showing content filter hit rates, top triggered rules, and false positive trends. Identify which content patterns are most prevalent in spam targeting your organisation.
From policy review to content-clean inboxes.
Content Policy Review
We review your existing email policies, compliance requirements, and spam patterns. Identify the content categories and keywords most relevant to your organisation and industry sector.
Rule Set Design
Content filtering rules designed covering spam patterns, policy violations, and compliance requirements. Rules structured with appropriate scoring weights and action policies for each category.
Baseline Testing
Rules deployed in audit mode against live traffic. Hit rates and false positive rates measured over two weeks. Rules refined to eliminate false positives before enforcement is activated.
Enforcement Activation
Content filtering rules activated with quarantine or block actions as appropriate. Users notified of new content policies. Quarantine digest configured for held messages.
Policy Expansion
Additional content rules added as new spam patterns emerge or policy requirements change. Regulatory compliance rules updated as legislation evolves. Rules reviewed quarterly.
Ongoing Optimisation
Monthly review of content filter performance. False positive analysis and rule refinement. New keyword patterns added as spam campaigns targeting your organisation are identified.
How we have helped UK organisations enforce content policies.
Regulatory Content Compliance
A London financial services firm needed to enforce FCA-compliant email content policies across their team. Existing controls had no content-based enforcement, creating compliance risk.
Content filtering rules deployed covering FCA-relevant terms and patterns. Policy violations flagged for compliance review. Audit trail created for all content-triggered events. Compliance team satisfied.
Invoice Fraud Spam Campaigns
A Bristol manufacturing company was being targeted by invoice fraud spam campaigns using specific keyword patterns to appear legitimate. Source-based filtering was missing these messages.
Content rules targeting invoice fraud patterns deployed. Campaign-specific keywords added to filter rules. Fraud spam catch rate increased from 68% to 99.1%. Finance team protected.
Inappropriate Content Reaching Staff
A Leeds education provider was receiving inappropriate content in email that was passing source-based spam filters. HR and safeguarding teams required content-based controls.
Content filtering rules deployed covering inappropriate content categories. All flagged content quarantined for review. Safeguarding compliance requirements met. Zero inappropriate content delivered to staff.
Enforce your email content policies and stop spam that slips through source filters.
Our free content filter review identifies gaps in your current filtering, maps your policy requirements, and shows you exactly what content-based rules would catch that your existing controls are missing.