Enhance blacklist-check.sh with difficulty ratings and improved UX

- Add difficulty ratings (EASY/MODERATE/HARD) to each blacklist entry
- Show estimated delisting time for each listed blacklist
- Display removal URL directly next to each listed blacklist
- Improve summary with difficulty breakdown
- Add references to other diagnostic tools (email-diagnostics, history)
- Better guidance on delisting process based on difficulty level

Database format: rbl_host|name|removal_url|difficulty|time_estimate

New features help users prioritize delisting efforts:
- EASY listings can typically be removed same day
- MODERATE listings require 1-3 days, formal request process
- HARD listings may need 3-7+ days, complex procedures

Users now see actionable removal URLs directly in the output,
reducing need to search for delisting information.

Integration with email-diagnostics ecosystem for comprehensive
email troubleshooting workflow.

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

modules/email/blacklist-check.sh

@@ -24,16 +24,16 @@ fi
 print_success "Server IP: $SERVER_IP"
 echo ""
 
-# Common blacklists to check
-BLACKLISTS=(
-    "zen.spamhaus.org"
-    "bl.spamcop.net"
-    "b.barracudacentral.org"
-    "dnsbl.sorbs.net"
-    "bl.spameatingmonkey.net"
-    "dnsbl-1.uceprotect.net"
-    "cbl.abuseat.org"
-    "psbl.surriel.com"
+# Blacklist database with difficulty ratings and removal URLs
+# Format: "rbl_host|display_name|removal_url|difficulty|estimated_time"
+BLACKLISTS_DB=(
+    "zen.spamhaus.org|Spamhaus (ZEN)|https://check.spamhaus.org/|HARD|1-7 days"
+    "bl.spamcop.net|SpamCop RBL|https://www.spamcop.net/bl.shtml|EASY|Same day"
+    "bl.barracudacentral.org|Barracuda|https://www.barracudacentral.org/rbl/removal-request|MODERATE|1-3 days"
+    "dnsbl.sorbs.net|SORBS|http://www.sorbs.net/lookup.shtml|MODERATE|1-2 days"
+    "cbl.abuseat.org|CBL (Composite Block List)|https://cbl.abuseat.org/lookup.cgi|MODERATE|1-3 days"
+    "psbl.surriel.com|PSBL|https://psbl.org/|MODERATE|1-2 days"
+    "dnsbl-1.uceprotect.net|UCEPROTECT|http://www.uceprotect.net/en/rblcheck.php|HARD|3-7 days"
 )
 
 print_header "Checking Blacklists"
@@ -42,16 +42,19 @@ echo ""
 LISTED=0
 NOT_LISTED=0
 
-for bl in "${BLACKLISTS[@]}"; do
-    # Reverse IP for DNS lookup
+# Reverse IP once for all lookups
 REVERSED_IP=$(echo $SERVER_IP | awk -F. '{print $4"."$3"."$2"."$1}')
 
+for entry in "${BLACKLISTS_DB[@]}"; do
+    IFS='|' read -r rbl_host bl_name removal_url difficulty time_estimate <<< "$entry"
+
     # Check if listed
-    if host "$REVERSED_IP.$bl" &>/dev/null; then
-        print_error "✗ LISTED on $bl"
+    if host "$REVERSED_IP.$rbl_host" &>/dev/null; then
+        print_error "✗ LISTED on $bl_name [$difficulty - $time_estimate]"
+        echo "  Removal: $removal_url"
         ((LISTED++))
     else
-        print_success "✓ Not listed on $bl"
+        print_success "✓ Not listed on $bl_name"
         ((NOT_LISTED++))
     fi
 done
@@ -60,19 +63,28 @@ echo ""
 print_header "Summary"
 
 if [ "$LISTED" -eq 0 ]; then
-    print_success "✓ Server IP is not blacklisted ($NOT_LISTED blacklists checked)"
+    print_success "✓ Server IP is clean ($NOT_LISTED blacklists checked)"
+    echo "  Your server is not currently listed on any major blacklists."
 else
     print_warning "⚠ Server IP is listed on $LISTED blacklist(s)"
     echo ""
-    print_info "To delist your IP:"
-    echo "  1. Fix the underlying issue (spam, malware, etc.)"
-    echo "  2. Visit each blacklist's removal page"
-    echo "  3. Request delisting with justification"
+    print_info "Delisting Difficulty Breakdown:"
+    echo "  EASY (Same day): Check removal links above - usually automatic"
+    echo "  MODERATE (1-3 days): Submit formal request, typically responsive"
+    echo "  HARD (3-7+ days): Complex process, may require documentation"
     echo ""
-    echo "Common delisting links:"
-    echo "  Spamhaus: https://www.spamhaus.org/lookup/"
-    echo "  SpamCop: https://www.spamcop.net/bl.shtml"
-    echo "  Barracuda: https://www.barracudacentral.org/rbl/removal-request"
+    print_info "To delist your IP:"
+    echo "  1. Review the removal URLs shown above for each listing"
+    echo "  2. Identify and fix the underlying issue:"
+    echo "     - Check for security compromises or spam accounts"
+    echo "     - Verify SPF/DKIM/DMARC are correctly configured"
+    echo "     - Review mail queue for suspicious content"
+    echo "  3. Submit delisting request with justification"
+    echo "  4. Track status using blacklist-check.sh regularly"
+    echo ""
+    print_info "Additional resources:"
+    echo "  - Use 'email-diagnostics' for detailed analysis"
+    echo "  - Check ~/email-diagnostics-history.json for patterns"
 fi
 
 echo ""