Inbound Filter
The Inbound Filter section groups every rule that SGuard applies to messages received from external senders. Rules are evaluated in a fixed order — Allow List first, then Whitelist, then the spam/blacklist engine, then URL Blacklist and DKIM/RBL checks — so a rule earlier in the chain can short-circuit decisions made later.
Mailboxes in This Section
| Mailbox | Purpose |
|---|---|
| Allow List | Pre-approve senders so their mail bypasses spam scoring entirely |
| Whitelist | Always classify mail from listed senders as Clean (still scanned for malware) |
| Blacklist | Always block mail from listed senders, content patterns, or attachment fingerprints |
| Spam list management | Manage the keyword and pattern list used by the spam scoring engine |
| URL Blacklist | Block messages that contain known malicious URLs |
| Greylist Exceptions | Bypass greylist temporary deferrals for trusted senders |
| Greylist Status | Read-only runtime view of senders currently held by the greylist |
| DKIM Inspection List | List of domains whose mail must pass DKIM signature verification |
| RBL Exception List | Bypass Real-time Blackhole List checks for trusted senders or networks |
Topics
- Allow List — Pre-approve senders by domain or address
- Whitelist — Always deliver mail from trusted senders
- Blacklist — Always block mail from listed senders
- Spam list management — Manage spam keywords and patterns
- URL Blacklist — Block messages containing malicious URLs
- Greylist Exceptions — Bypass greylist for specific senders
- Greylist Status — View senders currently greylisted
- DKIM Inspection List — Domains that must pass DKIM
- RBL Exception List — Bypass RBL for trusted senders
tip
The four allow-style lists (Allow List, Whitelist, Greylist Exceptions, RBL Exception) each waive a different stage of inspection. See the comparison table on RBL Exception List before deciding which to use.