Fix NO_SPACE_IN_FROM spam tag detection logic (fixes #2372)

crates/spam-filter/src/analysis/from.rs

@@ -179,7 +179,12 @@ impl SpamFilterAnalyzeFrom for Server {
             // Validate space in FROM
             if !from_name.is_empty()
                 && !from_addr.address.is_empty()
-                && !from_raw_utf8.contains(" <")
+                && from_raw_utf8
+                    .as_bytes()
+                    .iter()
+                    .position(|&b| b == b'<')
+                    .and_then(|v| from_raw_utf8.as_bytes().get(v - 1))
+                    .is_none_or(|v| !v.is_ascii_whitespace())
             {
                 ctx.result.add_tag("NO_SPACE_IN_FROM");
             }

tests/resources/smtp/antispam/from.test

@@ -132,6 +132,14 @@ expect NO_SPACE_IN_FROM FROM_EQ_ENV_FROM FROM_HAS_DN
 
 From: "Hello"<hello@domain.org>
 
+Test
+<!-- NEXT TEST -->
+envelope_from hello@domain.org
+expect FROM_EQ_ENV_FROM FROM_HAS_DN
+
+From: "Hello"
+	<hello@domain.org>
+
 Test
 <!-- NEXT TEST -->
 envelope_from hello@domain.org

tests/src/smtp/inbound/antispam.rs

@@ -78,8 +78,9 @@ category = 0
 confidence = 1
 explanation = 2
 
-[spam-filter.reputation]
-enable = true
+[spam-filter.classifier.samples]
+min-ham = 10
+min-spam = 10
 
 [session.rcpt]
 relay = true