feat(email): Add auto-IP extraction and pre-filled blacklist lookup URLs

- Automatically extract server IP from rejection messages
- Generate pre-filled lookup URLs for top blacklists
- URLs include extracted IP for instant status checking:
  • Spamhaus: https://check.spamhaus.org/?ip=1.2.3.4
  • Barracuda: https://www.barracudacentral.org/rbl/lookup?ip=1.2.3.4
  • SpamCop: https://www.spamcop.net/query.html?ip=1.2.3.4
  • SORBS: http://www.sorbs.net/lookup.shtml?ip=1.2.3.4
- Users no longer need to manually copy IP and search
- Fallback to generic URLs if IP not found in message
- Tested with various IP formats and edge cases

User benefit: Instant access to blacklist status via clickable links

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

modules/email/email-diagnostics.sh

@@ -568,6 +568,12 @@ if [ "$bounced" -gt 0 ]; then
         TEMP_BLACKLISTS="/tmp/email_blacklists_$$.txt"
         grep -iE "blacklist|block list|RBL|DNSBL|listed in|blocked using|on our block list|S3150|S3140|AS\(48|CS01|local policy|gmail.*(suspicious|reputation|spam|detected).*reputation|gmail.*detected.*suspicious|spamhaus|barracuda|spamcop|sorbs|abuseat|yahoo.*block|yahoo.*reject|aol.*block|aol.*reject|me\.com.*reject|icloud.*reject|mac\.com.*reject|protonmail.*block|protonmail.*reject|pm\.me.*reject|zoho.*block|zoho.*reject|fastmail.*block|fastmail.*reject|outlook.*block|hotmail.*block|live\.com.*block|msn\.com.*block" "$TEMP_BOUNCES" > "$TEMP_BLACKLISTS" 2>/dev/null || true
 
+        # Try to extract server IP from rejection messages
+        extracted_ip=""
+        if grep -qiE '\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\]|from [0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' "$TEMP_BLACKLISTS" 2>/dev/null; then
+            extracted_ip=$(grep -oE '\[?[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\]?' "$TEMP_BLACKLISTS" 2>/dev/null | head -1 | tr -d '[]')
+        fi
+
         if [ -s "$TEMP_BLACKLISTS" ]; then
             # Blacklist/Provider detection with real-world message patterns
             # Format: "name|display_name|removal_url|detection_keywords"
@@ -627,10 +633,35 @@ if [ "$bounced" -gt 0 ]; then
             if [ -n "$detected_blacklists" ]; then
                 print_warning "    ⚠ SPECIFIC BLACKLISTS/BLOCKS DETECTED:"
                 echo ""
+                if [ -n "$extracted_ip" ]; then
+                    print_info "      Server IP detected: $extracted_ip"
+                    echo ""
+                fi
                 echo -e "$detected_blacklists" | sort -u | while IFS='|' read -r bl_name bl_url; do
                     if [ -n "$bl_name" ]; then
                         print_error "      • $bl_name"
+                        # Generate IP-specific lookup URL if IP was extracted
+                        if [ -n "$extracted_ip" ]; then
+                            case "$bl_url" in
+                                *spamhaus.org*)
+                                    echo "        Lookup: https://check.spamhaus.org/?ip=${extracted_ip}"
+                                    ;;
+                                *barracudacentral.org*)
+                                    echo "        Lookup: https://www.barracudacentral.org/rbl/lookup?ip=${extracted_ip}"
+                                    ;;
+                                *spamcop.net*)
+                                    echo "        Lookup: https://www.spamcop.net/query.html?ip=${extracted_ip}"
+                                    ;;
+                                *sorbs.net*)
+                                    echo "        Lookup: http://www.sorbs.net/lookup.shtml?ip=${extracted_ip}"
+                                    ;;
+                                *)
                                     echo "        Removal/Info: $bl_url"
+                                    ;;
+                            esac
+                        else
+                            echo "        Removal/Info: $bl_url"
+                        fi
                         echo ""
                     fi
                 done