diff --git a/internal/config/cli.go b/internal/config/cli.go
index 17f0ff6..2a61bad 100644
--- a/internal/config/cli.go
+++ b/internal/config/cli.go
@@ -37,6 +37,7 @@ func declareFlags(o *Config) {
 	flag.DurationVar(&o.Analysis.DNSTimeout, "dns-timeout", o.Analysis.DNSTimeout, "Timeout when performing DNS query")
 	flag.DurationVar(&o.Analysis.HTTPTimeout, "http-timeout", o.Analysis.HTTPTimeout, "Timeout when performing HTTP query")
 	flag.Var(&StringArray{&o.Analysis.RBLs}, "rbl", "Append a RBL (use this option multiple time to append multiple RBLs)")
+	flag.BoolVar(&o.Analysis.CheckAllIPs, "check-all-ips", o.Analysis.CheckAllIPs, "Check all IPs found in email headers against RBLs (not just the first one)")
 	flag.DurationVar(&o.ReportRetention, "report-retention", o.ReportRetention, "How long to keep reports (e.g., 720h, 30d). 0 = keep forever")
 	flag.UintVar(&o.RateLimit, "rate-limit", o.RateLimit, "API rate limit (requests per second per IP)")
 	flag.Var(&URL{&o.SurveyURL}, "survey-url", "URL for user feedback survey")
diff --git a/internal/config/config.go b/internal/config/config.go
index 6f35ec7..be5e63a 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -61,9 +61,10 @@ type EmailConfig struct {
 
 // AnalysisConfig contains timeout and behavior settings for email analysis
 type AnalysisConfig struct {
-	DNSTimeout  time.Duration
-	HTTPTimeout time.Duration
-	RBLs        []string
+	DNSTimeout   time.Duration
+	HTTPTimeout  time.Duration
+	RBLs         []string
+	CheckAllIPs  bool // Check all IPs found in headers, not just the first one
 }
 
 // DefaultConfig returns a configuration with sensible defaults
@@ -86,6 +87,7 @@ func DefaultConfig() *Config {
 			DNSTimeout:  5 * time.Second,
 			HTTPTimeout: 10 * time.Second,
 			RBLs:        []string{},
+			CheckAllIPs: false, // By default, only check the first IP
 		},
 	}
 }
diff --git a/pkg/analyzer/analyzer.go b/pkg/analyzer/analyzer.go
index 80fa7f2..99b7b52 100644
--- a/pkg/analyzer/analyzer.go
+++ b/pkg/analyzer/analyzer.go
@@ -44,6 +44,7 @@ func NewEmailAnalyzer(cfg *config.Config) *EmailAnalyzer {
 		cfg.Analysis.DNSTimeout,
 		cfg.Analysis.HTTPTimeout,
 		cfg.Analysis.RBLs,
+		cfg.Analysis.CheckAllIPs,
 	)
 
 	return &EmailAnalyzer{
diff --git a/pkg/analyzer/content.go b/pkg/analyzer/content.go
index 613e5d5..3150d50 100644
--- a/pkg/analyzer/content.go
+++ b/pkg/analyzer/content.go
@@ -751,7 +751,7 @@ func (c *ContentAnalyzer) CalculateContentScore(results *ContentResults) (int, s
 				brokenLinks++
 			}
 		}
-		score += 20 * brokenLinks / len(results.Links)
+		score += 20 * (len(results.Links) - brokenLinks) / len(results.Links)
 		// Too much links, 10 points penalty
 		if len(results.Links) > 30 {
 			score -= 10
@@ -769,7 +769,7 @@ func (c *ContentAnalyzer) CalculateContentScore(results *ContentResults) (int, s
 				noAltCount++
 			}
 		}
-		score += 15 * noAltCount / len(results.Images)
+		score += 15 * (len(results.Images) - noAltCount) / len(results.Images)
 	} else {
 		// No images is Ok
 		score += 15
diff --git a/pkg/analyzer/rbl.go b/pkg/analyzer/rbl.go
index 832c61c..5e8b503 100644
--- a/pkg/analyzer/rbl.go
+++ b/pkg/analyzer/rbl.go
@@ -34,9 +34,10 @@ import (
 
 // RBLChecker checks IP addresses against DNS-based blacklists
 type RBLChecker struct {
-	Timeout  time.Duration
-	RBLs     []string
-	resolver *net.Resolver
+	Timeout     time.Duration
+	RBLs        []string
+	CheckAllIPs bool // Check all IPs found in headers, not just the first one
+	resolver    *net.Resolver
 }
 
 // DefaultRBLs is a list of commonly used RBL providers
@@ -50,7 +51,7 @@ var DefaultRBLs = []string{
 }
 
 // NewRBLChecker creates a new RBL checker with configurable timeout and RBL list
-func NewRBLChecker(timeout time.Duration, rbls []string) *RBLChecker {
+func NewRBLChecker(timeout time.Duration, rbls []string, checkAllIPs bool) *RBLChecker {
 	if timeout == 0 {
 		timeout = 5 * time.Second // Default timeout
 	}
@@ -58,8 +59,9 @@ func NewRBLChecker(timeout time.Duration, rbls []string) *RBLChecker {
 		rbls = DefaultRBLs
 	}
 	return &RBLChecker{
-		Timeout: timeout,
-		RBLs:    rbls,
+		Timeout:     timeout,
+		RBLs:        rbls,
+		CheckAllIPs: checkAllIPs,
 		resolver: &net.Resolver{
 			PreferGo: true,
 		},
@@ -96,6 +98,11 @@ func (r *RBLChecker) CheckEmail(email *EmailMessage) *RBLResults {
 				results.ListedCount++
 			}
 		}
+
+		// Only check the first IP unless CheckAllIPs is enabled
+		if !r.CheckAllIPs {
+			break
+		}
 	}
 
 	return results
diff --git a/pkg/analyzer/rbl_test.go b/pkg/analyzer/rbl_test.go
index f18464a..a1de270 100644
--- a/pkg/analyzer/rbl_test.go
+++ b/pkg/analyzer/rbl_test.go
@@ -55,7 +55,7 @@ func TestNewRBLChecker(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			checker := NewRBLChecker(tt.timeout, tt.rbls)
+			checker := NewRBLChecker(tt.timeout, tt.rbls, false)
 			if checker.Timeout != tt.expectedTimeout {
 				t.Errorf("Timeout = %v, want %v", checker.Timeout, tt.expectedTimeout)
 			}
@@ -97,7 +97,7 @@ func TestReverseIP(t *testing.T) {
 		},
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -157,7 +157,7 @@ func TestIsPublicIP(t *testing.T) {
 		},
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -237,7 +237,7 @@ func TestExtractIPs(t *testing.T) {
 		},*/
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -322,7 +322,7 @@ func TestGetBlacklistScore(t *testing.T) {
 		},
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -351,7 +351,7 @@ func TestGetUniqueListedIPs(t *testing.T) {
 		},
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 	listedIPs := checker.GetUniqueListedIPs(results)
 
 	expectedIPs := []string{"198.51.100.1", "198.51.100.2"}
@@ -376,7 +376,7 @@ func TestGetRBLsForIP(t *testing.T) {
 		},
 	}
 
-	checker := NewRBLChecker(5*time.Second, nil)
+	checker := NewRBLChecker(5*time.Second, nil, false)
 
 	tests := []struct {
 		name         string
diff --git a/pkg/analyzer/report.go b/pkg/analyzer/report.go
index bd6b866..a39a98a 100644
--- a/pkg/analyzer/report.go
+++ b/pkg/analyzer/report.go
@@ -44,12 +44,13 @@ func NewReportGenerator(
 	dnsTimeout time.Duration,
 	httpTimeout time.Duration,
 	rbls []string,
+	checkAllIPs bool,
 ) *ReportGenerator {
 	return &ReportGenerator{
 		authAnalyzer:    NewAuthenticationAnalyzer(),
 		spamAnalyzer:    NewSpamAssassinAnalyzer(),
 		dnsAnalyzer:     NewDNSAnalyzer(dnsTimeout),
-		rblChecker:      NewRBLChecker(dnsTimeout, rbls),
+		rblChecker:      NewRBLChecker(dnsTimeout, rbls, checkAllIPs),
 		contentAnalyzer: NewContentAnalyzer(httpTimeout),
 		headerAnalyzer:  NewHeaderAnalyzer(),
 	}
diff --git a/pkg/analyzer/report_test.go b/pkg/analyzer/report_test.go
index bf413ce..5a325b1 100644
--- a/pkg/analyzer/report_test.go
+++ b/pkg/analyzer/report_test.go
@@ -32,7 +32,7 @@ import (
 )
 
 func TestNewReportGenerator(t *testing.T) {
-	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs)
+	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs, false)
 	if gen == nil {
 		t.Fatal("Expected report generator, got nil")
 	}
@@ -55,7 +55,7 @@ func TestNewReportGenerator(t *testing.T) {
 }
 
 func TestAnalyzeEmail(t *testing.T) {
-	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs)
+	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs, false)
 
 	email := createTestEmail()
 
@@ -75,7 +75,7 @@ func TestAnalyzeEmail(t *testing.T) {
 }
 
 func TestGenerateReport(t *testing.T) {
-	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs)
+	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs, false)
 	testID := uuid.New()
 
 	email := createTestEmail()
@@ -130,7 +130,7 @@ func TestGenerateReport(t *testing.T) {
 }
 
 func TestGenerateReportWithSpamAssassin(t *testing.T) {
-	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs)
+	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs, false)
 	testID := uuid.New()
 
 	email := createTestEmailWithSpamAssassin()
@@ -150,7 +150,7 @@ func TestGenerateReportWithSpamAssassin(t *testing.T) {
 }
 
 func TestGenerateRawEmail(t *testing.T) {
-	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs)
+	gen := NewReportGenerator(10*time.Second, 10*time.Second, DefaultRBLs, false)
 
 	tests := []struct {
 		name     string