Setting up spam-filter rules, quarantine and digests

Inbound mail on every domain is filtered by MxGuard automatically — it's attached during provisioning — but you also get controls over how it behaves.

What you can configure

• Per-domain sender rules — allow or block specific senders for a domain.
• Quarantine — messages the filter holds back rather than delivering.
• Daily digest notifications summarising what was caught, so nothing is silently lost.

How the filtering works underneath

Messages pass through a LightGBM classifier (0.988 AUC) inside a full reputation pipeline — Postscreen DNSBLs (Spamhaus ZEN, CBL, SORBS, Mailspike, PSBL), URI blocklists (uribl, surbl, Spamhaus DBL), SPF/DKIM/DMARC checks with ARC sealing, ClamAV virus scanning and attachment-risk scoring, plus recipient verification to avoid backscatter.

Nothing to buy

All of this is included free on every plan — there's no separate anti-spam product to license or configure from scratch.