feat(mailer-smtp): add in-process security pipeline for SMTP delivery (DKIM/SPF/DMARC, content scanning, IP reputation)

rust/crates/mailer-security/src/content_scanner.rs

@@ -5,14 +5,14 @@
 //! script injection, and sensitive data patterns.
 
 use regex::Regex;
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 use std::sync::LazyLock;
 
 // ---------------------------------------------------------------------------
 // Result types
 // ---------------------------------------------------------------------------
 
-#[derive(Debug, Clone, Serialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct ContentScanResult {
     pub threat_score: u32,