MxGuard Business

MxGuard Business is a cloud-delivered, hybrid-AI email security gateway that stops spam, phishing, malware and business-email-compromise before they ever reach your inbox. Point your domain's MX record at MxGuard and every inbound message is scored, sorted and forwarded on to your real mail server — with a single web console to manage everything. £16.99 per domain per month, with 25 mailboxes included.

How it works

MxGuard sits in front of your existing mail server. A gradient-boosted machine-learning classifier scores the easy 95% of mail in milliseconds. The borderline messages — the ones that matter most — are handed to Claude, Anthropic's large language model, which reads them the way a person would before a verdict is reached. Every verdict comes with a plain-English reason, so you can always see exactly why a message was tagged, quarantined or rejected.

Why old filters fail and MxGuard doesn't

Rule-based and Bayesian filters were built for an era of obvious spam. They miss the carefully written, well-targeted attacks: CEO impersonation, invoice redirection, gift-card fraud, lookalike domains and AI-written phishing with perfect grammar. These payload-free attacks sail past legacy filters — and they are exactly where MxGuard's LLM layer is strongest.

What MxGuard stops

• Phishing — credential-harvest pages, fake login flows and OAuth-consent traps.
• BEC and impersonation — CEO fraud, invoice redirection, supplier impersonation, gift-card scams.
• Malware and ransomware — ClamAV scans every attachment, including archives; macro-bearing Office docs and HTML smuggling scored heavily.
• Bulk spam and UCE — classic spam, snowshoe and hailstorm campaigns, with near-zero false positives on legitimate bulk mail.
• Lookalike domains — homoglyph attacks, doubled letters and ccTLD swaps, checked at envelope, From header and reply-to.
• Backscatter and spoofing — SPF/DKIM/DMARC enforcement plus ARC sealing through forwarding.

Included on every domain

• ML-based threat scoring with sub-5ms decisions.
• Claude LLM evaluation on uncertain mail, with transparent written verdicts.
• Real-time live feed dashboard showing mail as it's processed.
• Daily digest emails with one-click release and block actions.
• Allow / block rules with hit tracking.
• URIBL, Spamhaus and URLhaus threat feeds.
• ClamAV attachment scanning.
• ARC sealing for forwarded mail.
• Self-service domain management — no support tickets needed.
• 30-day quarantine retention.
• 25 mailboxes included (add packs of 25 for more).
• Active-active high availability across two UK gateways (mx1 + mx2).

No hardware, no installs, no capital cost

MxGuard runs in our UK-based cloud. There's nothing to deploy on your premises, no agents to install and no firewall rules to add. Most customers are live within a working day. Subscription pricing means no up-front investment and no surprise upgrade costs.

UK-hosted and GDPR-aligned

Your mail data is processed and stored in the UK. Month-to-month billing with no minimum contract, no setup fees and no annual lock-in. 10% off on annual prepay.

Migrating from eFa? eFa reaches end-of-life in July 2026. MxGuard is a direct replacement that runs in the same MX-fronting role with modern detection. We import your existing allow/block lists and provide guided cutover assistance free of charge — most migrations complete inside two days.