Inspection mode differences for email filter
This section identifies the behavioral differences between Email Filter operating in flow and proxy inspection.
Feature comparison between Email Filter inspection modes
The following table indicates which Email Filters are supported by their designated inspection modes.
| SMTP | POP3 | IMAP | MAPI | |
|---|---|---|---|---|
| Proxy | Yes | Yes | Yes | Yes |
| Flow | Yes | Yes | Yes | No |
Feature comparison between Email Filter inspection modes
The following tables indicate which Email Filters are supported by the specified inspection modes for local filtering and FortiGuard-assisted filtering.
| Local Filtering | Banned Word Check | Block/Allowlist | HELO/ EHLO DNS Check | Return Address DNS Check | DNSBL/ ORBL Check | MIME Header Check |
File Filter |
|---|---|---|---|---|---|---|---|
| Proxy | Yes | Yes | Yes | Yes | Yes | Yes |
Yes |
| Flow | Yes | No | No | No | No | Yes |
No |
| FortiGuard-Assisted Filtering | Phishing URL Check | Anti-Spam Blocklist Check | Submit Spam to FortiGuard | Spam Email Checksum Check |
Spam URL Check |
|---|---|---|---|---|---|
| Proxy | Yes | Yes | Yes | Yes |
Yes |
| Flow | No | No | No | No |
No |