Business Email Filtering and Anti-Spam Service

Our email filtering service blocks spam, bulk marketing, known phishing attempts, malware-laden attachments, and emails from blacklisted senders before they reach your inbox. Filters are applied at the gateway level using reputation scoring, content analysis, and sender authentication checks including SPF, DKIM, and DMARC validation. With 85% of businesses that experienced a breach identifying phishing as the attack vector (DSIT 2025), effective filtering is a frontline defence.

We configure quarantine policies that hold suspicious emails for review rather than silently deleting them. Users receive daily digest notifications listing quarantined items and can release legitimate messages themselves or request admin approval. Our engineers continuously tune filtering rules based on quarantine patterns, significantly reducing false positive rates within the first month of deployment.

Email filtering is one of the most effective first lines of defence against ransomware delivered via email. Our service blocks executable attachments, password-protected archives commonly used to evade scanning, and links to known malicious download sites. Given that 19,000 UK businesses were hit by ransomware in 2025 (Sophos State of Ransomware 2025), filtering malicious emails before they reach staff inboxes dramatically reduces your exposure.

Microsoft 365 includes Exchange Online Protection as a baseline, but its default settings leave significant gaps. Many organisations benefit from additional gateway filtering, stricter attachment policies, and enhanced quarantine management beyond the out-of-the-box configuration. We optimise your M365 email filtering policies and layer additional rules to catch threats that default settings miss, providing a measurably stronger security posture.

For Microsoft 365 environments, we typically complete email filtering configuration within one to two business days. This includes setting up transport rules, configuring anti-spam and anti-malware policies, enabling quarantine notifications, and verifying DMARC, DKIM, and SPF records. There is no downtime or disruption to email flow during deployment. With the average disruptive breach costing £3,550 (DSIT 2025), rapid deployment is a priority.