diff --git a/legacy/exitrace/exitrace.sh b/legacy/exitrace/exitrace.sh
index 87ef40a..0b78107 100755
--- a/legacy/exitrace/exitrace.sh
+++ b/legacy/exitrace/exitrace.sh
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 # exitrace - Exim-Log-Trace & Status für einzelne Mails/Adressen/Domain-Ziele
 # Maintainer: ljp
+# Modular version - requires lib/ directory
 # -----------------------------------------------------------------------------
 # Features:
 # - Sucht in /var/log/easyname/YYYY/MM/YYYY-MM-DD.log(.gz) (anpassbar mit $LOGROOT)
@@ -20,8 +21,26 @@
 
 set -euo pipefail
 
+# Script directory
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Load modules
+if [[ -f "$SCRIPT_DIR/lib/date_utils.sh" ]]; then
+  source "$SCRIPT_DIR/lib/date_utils.sh"
+else
+  echo "Fehler: lib/date_utils.sh nicht gefunden in $SCRIPT_DIR" >&2
+  exit 1
+fi
+
+if [[ -f "$SCRIPT_DIR/lib/mx_lookup.sh" ]]; then
+  source "$SCRIPT_DIR/lib/mx_lookup.sh"
+else
+  echo "Fehler: lib/mx_lookup.sh nicht gefunden in $SCRIPT_DIR" >&2
+  exit 1
+fi
+
+# Global settings
 LOGROOT="${LOGROOT:-/var/log/easyname}"
-DATE_FMT="%Y-%m-%d"
 TODAY="$(date +%Y-%m-%d)"
 
 usage() {
@@ -60,10 +79,22 @@ DRYRUN=0; WANT_MX=0
 
 while [[ $# -gt 0 ]]; do
   case "$1" in
-    -H|--hours)        HOURS="${2:-}"; shift 2 ;;
-    -DAYS|--days)      DAYS="${2:-}"; shift 2 ;;
-    -d|--date)         DATE_ONE="${2:-}"; shift 2 ;;
-    -r|--range)        DATE_RANGE="${2:-}"; shift 2 ;;
+    -H|--hours)        
+      HOURS="${2:-}"
+      validate_positive_integer "$HOURS" "--hours"
+      shift 2 ;;
+    -DAYS|--days)      
+      DAYS="${2:-}"
+      validate_positive_integer "$DAYS" "--days"
+      shift 2 ;;
+    -d|--date)         
+      DATE_ONE="${2:-}"
+      validate_date "$DATE_ONE" "--date"
+      shift 2 ;;
+    -r|--range)        
+      DATE_RANGE="${2:-}"
+      validate_date_range "$DATE_RANGE"
+      shift 2 ;;
     -f|--from)         FROM="${2:-}"; shift 2 ;;
     -t|--to)           TO_REGEX="${2:-}"; shift 2 ;;
     -D|--domain)       TARGET_DOMAIN="${2:-}"; shift 2 ;;
@@ -77,45 +108,6 @@ while [[ $# -gt 0 ]]; do
 done
 
 # ------------------------- Datums-Liste bauen --------------------------------
-files_for_date() {
-  local d="$1" y="${d:0:4}" m="${d:5:2}"
-  local p="${LOGROOT}/${y}/${m}/${d}.log"
-  if [[ -f "$p" ]]; then
-    printf "%s\n" "$p"
-  fi
-  if [[ -f "${p}.gz" ]]; then
-    printf "%s\n" "${p}.gz"
-  fi
-}
-
-gen_dates_hours_back() {
-  local hrs="$1" start_ts end_ts cur
-  end_ts="$(date +%s)"
-  start_ts="$(date -d "-${hrs} hours" +%s)"
-  cur="$(date -d "@$start_ts" +${DATE_FMT})"
-  while :; do
-    echo "$cur"
-    [[ "$(date -d "$cur +1 day" +%s)" -le "$end_ts" ]] || break
-    cur="$(date -d "$cur +1 day" +${DATE_FMT})"
-  done
-}
-
-gen_dates_days_back() {
-  local days="$1" i
-  for ((i=0;i<=days;i++)); do
-    date -d "-$i day" +${DATE_FMT}
-  done
-}
-
-gen_dates_range() {
-  local a="${1%%..*}" b="${1##*..}" cur="$a"
-  while :; do
-    echo "$cur"
-    [[ "$cur" == "$b" ]] && break
-    cur="$(date -d "$cur +1 day" +${DATE_FMT})"
-  done
-}
-
 declare -a DATES=()
 if [[ -n "$HOURS" ]]; then
   mapfile -t DATES < <(gen_dates_hours_back "$HOURS")
@@ -176,193 +168,15 @@ grep_chain() {
 
 # ------------------------------- MX Block ------------------------------------
 if (( WANT_MX )) && [[ -n "$TARGET_DOMAIN" ]]; then
-  if command -v dig >/dev/null 2>&1; then
-    echo "== MX für ${TARGET_DOMAIN} =="
-    dig +short MX "$TARGET_DOMAIN" | sort -n || true
-    echo "-- A/AAAA der MX:"
-    while read -r mx; do
-      host="${mx#* }"
-      printf "%-35s | " "$host"
-      dig +short A "$host" | paste -sd, - || true
-      printf "%-35s | " ""
-      dig +short AAAA "$host" | paste -sd, - || true
-    done < <(dig +short MX "$TARGET_DOMAIN" | sort -n)
-    echo "========================================================================"
-  else
-    echo "(Hinweis) dig nicht gefunden, MX-Ausgabe übersprungen."
-  fi
+  show_mx_records "$TARGET_DOMAIN"
 fi
 
 # ---------------------------- Auswertung (awk) --------------------------------
-grep_chain | awk -v TO_RE="${TO_REGEX:-}" -v WANTDOM="${TARGET_DOMAIN:-}" -v MSGIDREQ="${MSGID:-}" -v FROMREQ="${FROM:-}" -v EXTRA="${GREPEXTRA:-}" '
-function trim(s){ sub(/^[ \t\r\n]+/, "", s); sub(/[ \t\r\n]+$/, "", s); return s }
-function add_rcpt(id, rc){ if (!(rc in rcpts[id])) rcpts[id][rc]=1 }
-function incr(a, k){ a[k]++; return a[k] }
+if [[ ! -f "$SCRIPT_DIR/lib/log_analyzer.awk" ]]; then
+  echo "Fehler: lib/log_analyzer.awk nicht gefunden in $SCRIPT_DIR" >&2
+  exit 1
+fi
 
-BEGIN { FS=" " }
-
-{
-  raw=$0
-
-  # Zeit + ID detektieren
-  match(raw, /[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} [A-Za-z0-9-]+/, t)
-  if (!t[0]) next
-  split(t[0], p, " ")
-  ts = p[1] " " p[2]
-  sub(/^[0-9-: ]+ /, "", raw_after) # restline
-  msgid = $1
-  if (!msgid) next
-
-  if (MSGIDREQ != "" && msgid != MSGIDREQ) next
-
-  # Init Times
-  if (!(msgid in first_ts) || ts < first_ts[msgid]) first_ts[msgid]=ts
-  if (!(msgid in last_ts)  || ts > last_ts[msgid])  last_ts[msgid]=ts
-
-  # Sender extrahieren
-  if (index($0, "<=") == 1 || $2 == "<=") {
-    if (match($0, / from <[^>]+>/, m)) {
-      s=m[0]; gsub(/.* from </, "", s); gsub(/>.*/, "", s)
-      from=trim(s)
-    } else if (match($0, /<= [^ ]+@[^ ]+/, m2)) {
-      split(m2[0], a, " "); from=trim(a[2])
-    } else { from="" }
-    if (from != "") {
-      from_addr[msgid]=from
-      if (FROMREQ != "" && from != FROMREQ) from_mismatch[msgid]=1
-    }
-  }
-
-  # Empfänger extrahieren
-  rcpt=""
-  if (match($0, / for <[^>]+>/, r)) {
-    rcpt=r[0]; gsub(/ for </, "", rcpt); gsub(/>/, "", rcpt); rcpt=trim(rcpt)
-  } else if (match($0, /\*\* [^ ]+@[^ ]+/, r2)) {
-    split(r2[0], b, " "); rcpt=trim(b[2])
-  }
-  if (rcpt != "") add_rcpt(msgid, rcpt)
-
-  # Klassify line types
-  is_delivery = index($0, " => ")>0
-  is_fail     = index($0, " ** ")>0
-  is_remote   = (index($0, " T=remote_smtp")>0 || index($0, " T=remote_smtp_dkim")>0)
-
-  # Success detection: C="250 ..." oder "250 " in C=...
-  is_success = 0
-  if (is_delivery && is_remote) {
-    if (match($0, /C="[^"]*250[^"]*"/)) is_success=1
-  }
-
-  # Deferred detection
-  # typische Phrasen: "retry time not reached", "temporarily", "Connection timed out", "have been failing"
-  is_defer = 0
-  if (is_remote && (index($0, "retry time not reached")>0 || index($0, "temporar")>0 || index($0, "timed out")>0 || match($0, /all hosts for '\''[^']+'\'' have been failing/))) {
-    is_defer=1
-  }
-
-  # Fail detection (permanent)
-  # Zeilen mit "** rcpt ..." sind i. d. R. permanent; weitere Marker: "Unrouteable address", "rejected", "mailbox full" kann defer sein -> belassen
-  is_perm_fail = 0
-  if (is_fail) {
-    is_perm_fail=1
-  } else if (match($0, /(Unrouteable address|no such user|User unknown|550 )/)) {
-    is_perm_fail=1
-  }
-
-  # Domainfilter (weicher): wir verwerfen die ID nicht, zeigen aber non-matching Zeilen trotzdem mit
-  if (WANTDOM != "") {
-    # keine harte Filterung, nur spätere Auswertung nutzt WANTDOM, falls nötig
-    ;
-  }
-
-  # Extra Regex? (nur für Zeilenfilterung, ID bleibt)
-  if (EXTRA != "" && $0 !~ EXTRA) {
-    ; # wir speichern die Zeile dennoch im Voll-Log, sonst verliert man Kontext
-  }
-
-  # Counters
-  if (is_success) deliveries[msgid]++
-  if (is_defer)   defers[msgid]++
-  if (is_perm_fail) fails[msgid]++
-
-  # „have been failing …" Marker
-  if (match($0, /all hosts for '\''[^']+'\'' have been failing/)) {
-    fail_marker[msgid]=1
-  }
-
-  # Full log sammeln
-  status[msgid]=(status[msgid] ? status[msgid] "\n" : "") ts " | " $0
-}
-
-END {
-  # IDs einsammeln & sortieren
-  n=0
-  for (id in first_ts){ ids[++n]=id }
-  for (i=2;i<=n;i++){
-    key=ids[i]; j=i-1
-    while (j>=1 && first_ts[ids[j]] > first_ts[key]) { ids[j+1]=ids[j]; j-- }
-    ids[j+1]=key
-  }
-
-  if (n==0){
-    print "Keine passenden Einträge im gewählten Zeitfenster gefunden."
-    exit 0
-  }
-
-  sep="------------------------------------------------------------------------"
-  for (k=1;k<=n;k++){
-    id=ids[k]
-
-    # FROM Nachfilter
-    if (FROMREQ != "" && from_mismatch[id]==1) {
-      if (from_addr[id] != FROMREQ && from_addr[id] != "") continue
-    }
-
-    d=(id in deliveries ? deliveries[id] : 0)
-    e=(id in defers     ? defers[id]     : 0)
-    f=(id in fails      ? fails[id]      : 0)
-
-    # Status-Logik:
-    # - d>0 && f==0 && e==0         -> OK
-    # - d>0 && (f>0 || e>0)         -> PARTIAL
-    # - d==0 && f>0                 -> FAIL
-    # - d==0 && f==0 && e>0         -> DELAY
-    # - sonst                       -> UNKNOWN
-    status_txt="UNKNOWN"
-    if (d>0 && f==0 && e==0) status_txt="OK"
-    else if (d>0 && (f>0 || e>0)) status_txt="PARTIAL"
-    else if (d==0 && f>0) status_txt="FAIL"
-    else if (d==0 && f==0 && e>0) status_txt="DELAY"
-
-    # Summary-Zeile
-    # Rcpts sammeln
-    out_rcpts=""
-    if (id in rcpts){
-      for (r in rcpts[id]) {
-        out_rcpts = (out_rcpts=="" ? r : out_rcpts ", " r)
-      }
-    }
-    printf "[%s] ID=%s | First=%s | From=%s | Rcpts=%s | Delivered=%d Deferred=%d Failed=%d\n",
-      status_txt, id, first_ts[id], (from_addr[id] ? from_addr[id] : "(?)"), (out_rcpts=="" ? "(?)" : out_rcpts), d, e, f
-
-    # Marker-Hinweis
-    if (fail_marker[id]) {
-      printf "  Note: DELIVERY STALL erkannt: '\''all hosts for domain failing (retry/backoff)'\''\n"
-    }
-
-    # Detailblock
-    print sep
-    printf "ID:        %s\n", id
-    printf "First:     %s\n", first_ts[id]
-    printf "Last:      %s\n", last_ts[id]
-    printf "From:      %s\n", (from_addr[id] ? from_addr[id] : "(unbekannt)")
-    printf "Rcpts:     %s\n", (out_rcpts=="" ? "(unbekannt)" : out_rcpts)
-    printf "Status:    %s (Delivered=%d, Deferred=%d, Failed=%d)\n", status_txt, d, e, f
-    print "Log:"
-    print status[id]
-    print sep
-  }
-}
-'
+grep_chain | awk -v TO_RE="${TO_REGEX:-}" -v WANTDOM="${TARGET_DOMAIN:-}" -v MSGIDREQ="${MSGID:-}" -v FROMREQ="${FROM:-}" -v EXTRA="${GREPEXTRA:-}" -f "$SCRIPT_DIR/lib/log_analyzer.awk"
 
 # Built with the help of Claude Code
\ No newline at end of file
diff --git a/legacy/exitrace/lib/date_utils.sh b/legacy/exitrace/lib/date_utils.sh
new file mode 100644
index 0000000..ee877be
--- /dev/null
+++ b/legacy/exitrace/lib/date_utils.sh
@@ -0,0 +1,118 @@
+#!/usr/bin/env bash
+# date_utils.sh - Date utility functions for exitrace
+# Maintainer: ljp
+
+# Constants
+readonly DATE_FMT="%Y-%m-%d"
+readonly MAX_DAYS_LIMIT=400
+
+# Validation functions
+validate_positive_integer() {
+  local value="$1"
+  local param="$2"
+  if [[ -z "$value" ]]; then
+    echo "Fehler: Parameter $param benötigt einen Wert" >&2
+    exit 1
+  fi
+  if ! [[ "$value" =~ ^[0-9]+$ ]]; then
+    echo "Fehler: $param muss eine positive Zahl sein (gegeben: '$value')" >&2
+    exit 1
+  fi
+  if [[ "$value" -eq 0 ]]; then
+    echo "Fehler: $param muss größer als 0 sein" >&2
+    exit 1
+  fi
+}
+
+validate_date() {
+  local date_val="$1"
+  local param="$2"
+  if [[ -z "$date_val" ]]; then
+    echo "Fehler: Parameter $param benötigt einen Wert" >&2
+    exit 1
+  fi
+  if ! date -d "$date_val" >/dev/null 2>&1; then
+    echo "Fehler: Ungültiges Datumsformat für $param: '$date_val'" >&2
+    echo "Erwartetes Format: YYYY-MM-DD" >&2
+    exit 1
+  fi
+}
+
+validate_date_range() {
+  local range="$1"
+  if [[ -z "$range" ]]; then
+    echo "Fehler: --range benötigt einen Wert" >&2
+    exit 1
+  fi
+  if [[ "$range" != *".."* ]]; then
+    echo "Fehler: Ungültiges Range-Format: '$range'" >&2
+    echo "Erwartetes Format: YYYY-MM-DD..YYYY-MM-DD" >&2
+    exit 1
+  fi
+  local start_date="${range%%..*}"
+  local end_date="${range##*..}"
+  validate_date "$start_date" "--range Startdatum"
+  validate_date "$end_date" "--range Enddatum"
+}
+
+# Date generation functions
+gen_dates_hours_back() {
+  local hrs="$1" start_ts end_ts cur next_ts
+  end_ts="$(date +%s)" || { echo "Fehler: Kann aktuellen Timestamp nicht ermitteln" >&2; exit 1; }
+  start_ts="$(date -d "-${hrs} hours" +%s)" || { echo "Fehler: Kann Start-Timestamp nicht berechnen" >&2; exit 1; }
+  cur="$(date -d "@$start_ts" +${DATE_FMT})" || { echo "Fehler: Kann Startdatum nicht formatieren" >&2; exit 1; }
+  
+  local iterations=0
+  while :; do
+    echo "$cur"
+    next_ts="$(date -d "$cur +1 day" +%s 2>/dev/null)" || { echo "Fehler: Datumsberechnung fehlgeschlagen für $cur" >&2; exit 1; }
+    [[ "$next_ts" -le "$end_ts" ]] || break
+    cur="$(date -d "$cur +1 day" +${DATE_FMT} 2>/dev/null)" || { echo "Fehler: Datum-Inkrement fehlgeschlagen für $cur" >&2; exit 1; }
+    
+    # Sicherheit gegen Endlosschleifen
+    ((iterations++))
+    if [[ $iterations -gt $MAX_DAYS_LIMIT ]]; then
+      echo "Fehler: Zu viele Tage im Zeitfenster (>$MAX_DAYS_LIMIT Tage)" >&2
+      exit 1
+    fi
+  done
+}
+
+gen_dates_days_back() {
+  local days="$1" i
+  for ((i=0;i<=days;i++)); do
+    date -d "-$i day" +${DATE_FMT} || { echo "Fehler: Kann Datum für -$i day nicht berechnen" >&2; exit 1; }
+  done
+}
+
+gen_dates_range() {
+  local a="${1%%..*}" b="${1##*..}" cur="$a"
+  local iterations=0
+  
+  while :; do
+    echo "$cur"
+    [[ "$cur" == "$b" ]] && break
+    cur="$(date -d "$cur +1 day" +${DATE_FMT} 2>/dev/null)" || { echo "Fehler: Datum-Inkrement fehlgeschlagen für $cur" >&2; exit 1; }
+    
+    # Sicherheit gegen Endlosschleifen
+    ((iterations++))
+    if [[ $iterations -gt $MAX_DAYS_LIMIT ]]; then
+      echo "Fehler: Zu großer Datumsbereich (>$MAX_DAYS_LIMIT Tage)" >&2
+      exit 1
+    fi
+  done
+}
+
+files_for_date() {
+  local d="$1" y="${d:0:4}" m="${d:5:2}"
+  local logroot="${LOGROOT:-/var/log/easyname}"
+  local p="${logroot}/${y}/${m}/${d}.log"
+  if [[ -f "$p" ]]; then
+    printf "%s\n" "$p"
+  fi
+  if [[ -f "${p}.gz" ]]; then
+    printf "%s\n" "${p}.gz"
+  fi
+}
+
+# Built with the help of Claude Code
\ No newline at end of file
diff --git a/legacy/exitrace/lib/log_analyzer.awk b/legacy/exitrace/lib/log_analyzer.awk
new file mode 100755
index 0000000..f6dd430
--- /dev/null
+++ b/legacy/exitrace/lib/log_analyzer.awk
@@ -0,0 +1,178 @@
+#!/usr/bin/awk -f
+# log_analyzer.awk - Exim log analyzer for exitrace
+# Maintainer: ljp
+# Processes Exim logs and classifies delivery status per Message-ID
+
+function trim(s){ sub(/^[ \t\r\n]+/, "", s); sub(/[ \t\r\n]+$/, "", s); return s }
+function add_rcpt(id, rc){ if (!(rc in rcpts[id])) rcpts[id][rc]=1 }
+function incr(a, k){ a[k]++; return a[k] }
+
+BEGIN { FS=" " }
+
+{
+  raw=$0
+
+  # Zeit + ID detektieren
+  match(raw, /[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} [A-Za-z0-9-]+/, t)
+  if (!t[0]) next
+  split(t[0], p, " ")
+  ts = p[1] " " p[2]
+  
+  # Extrahiere Rest der Zeile nach Timestamp für weitere Verarbeitung
+  raw_after = raw
+  sub(/^[^:]*:[^:]*:[^ ]+ /, "", raw_after)
+  msgid = $1
+  if (!msgid) next
+
+  if (MSGIDREQ != "" && msgid != MSGIDREQ) next
+
+  # Init Times
+  if (!(msgid in first_ts) || ts < first_ts[msgid]) first_ts[msgid]=ts
+  if (!(msgid in last_ts)  || ts > last_ts[msgid])  last_ts[msgid]=ts
+
+  # Sender extrahieren
+  if (index($0, "<=") == 1 || $2 == "<=") {
+    if (match($0, / from <[^>]+>/, m)) {
+      s=m[0]; gsub(/.* from </, "", s); gsub(/>.*/, "", s)
+      from=trim(s)
+    } else if (match($0, /<= [^ ]+@[^ ]+/, m2)) {
+      split(m2[0], a, " "); from=trim(a[2])
+    } else { from="" }
+    if (from != "") {
+      from_addr[msgid]=from
+      if (FROMREQ != "" && from != FROMREQ) from_mismatch[msgid]=1
+    }
+  }
+
+  # Empfänger extrahieren
+  rcpt=""
+  if (match($0, / for <[^>]+>/, r)) {
+    rcpt=r[0]; gsub(/ for </, "", rcpt); gsub(/>/, "", rcpt); rcpt=trim(rcpt)
+  } else if (match($0, /\*\* [^ ]+@[^ ]+/, r2)) {
+    split(r2[0], b, " "); rcpt=trim(b[2])
+  }
+  if (rcpt != "") add_rcpt(msgid, rcpt)
+
+  # Klassify line types
+  is_delivery = index($0, " => ")>0
+  is_fail     = index($0, " ** ")>0
+  is_remote   = (index($0, " T=remote_smtp")>0 || index($0, " T=remote_smtp_dkim")>0)
+
+  # Success detection: C="250 ..." oder "250 " in C=...
+  is_success = 0
+  if (is_delivery && is_remote) {
+    if (match($0, /C="[^"]*250[^"]*"/)) is_success=1
+  }
+
+  # Deferred detection
+  # typische Phrasen: "retry time not reached", "temporarily", "Connection timed out", "have been failing"
+  is_defer = 0
+  if (is_remote && (index($0, "retry time not reached")>0 || index($0, "temporar")>0 || index($0, "timed out")>0 || match($0, /all hosts for '\''[^']+'\'' have been failing/))) {
+    is_defer=1
+  }
+
+  # Fail detection (permanent)
+  # Zeilen mit "** rcpt ..." sind i. d. R. permanent; weitere Marker: "Unrouteable address", "rejected", "mailbox full" kann defer sein -> belassen
+  is_perm_fail = 0
+  if (is_fail) {
+    is_perm_fail=1
+  } else if (match($0, /(Unrouteable address|no such user|User unknown|550 )/)) {
+    is_perm_fail=1
+  }
+
+  # Domainfilter (weicher): wir verwerfen die ID nicht, zeigen aber non-matching Zeilen trotzdem mit
+  if (WANTDOM != "") {
+    # keine harte Filterung, nur spätere Auswertung nutzt WANTDOM, falls nötig
+    ;
+  }
+
+  # Extra Regex? (nur für Zeilenfilterung, ID bleibt)
+  if (EXTRA != "" && $0 !~ EXTRA) {
+    ; # wir speichern die Zeile dennoch im Voll-Log, sonst verliert man Kontext
+  }
+
+  # Counters
+  if (is_success) deliveries[msgid]++
+  if (is_defer)   defers[msgid]++
+  if (is_perm_fail) fails[msgid]++
+
+  # „have been failing …" Marker
+  if (match($0, /all hosts for '\''[^']+'\'' have been failing/)) {
+    fail_marker[msgid]=1
+  }
+
+  # Full log sammeln
+  status[msgid]=(status[msgid] ? status[msgid] "\n" : "") ts " | " $0
+}
+
+END {
+  # IDs einsammeln & sortieren
+  n=0
+  for (id in first_ts){ ids[++n]=id }
+  for (i=2;i<=n;i++){
+    key=ids[i]; j=i-1
+    while (j>=1 && first_ts[ids[j]] > first_ts[key]) { ids[j+1]=ids[j]; j-- }
+    ids[j+1]=key
+  }
+
+  if (n==0){
+    print "Keine passenden Einträge im gewählten Zeitfenster gefunden."
+    exit 0
+  }
+
+  sep="------------------------------------------------------------------------"
+  for (k=1;k<=n;k++){
+    id=ids[k]
+
+    # FROM Nachfilter
+    if (FROMREQ != "" && from_mismatch[id]==1) {
+      if (from_addr[id] != FROMREQ && from_addr[id] != "") continue
+    }
+
+    d=(id in deliveries ? deliveries[id] : 0)
+    e=(id in defers     ? defers[id]     : 0)
+    f=(id in fails      ? fails[id]      : 0)
+
+    # Status-Logik:
+    # - d>0 && f==0 && e==0         -> OK
+    # - d>0 && (f>0 || e>0)         -> PARTIAL
+    # - d==0 && f>0                 -> FAIL
+    # - d==0 && f==0 && e>0         -> DELAY
+    # - sonst                       -> UNKNOWN
+    status_txt="UNKNOWN"
+    if (d>0 && f==0 && e==0) status_txt="OK"
+    else if (d>0 && (f>0 || e>0)) status_txt="PARTIAL"
+    else if (d==0 && f>0) status_txt="FAIL"
+    else if (d==0 && f==0 && e>0) status_txt="DELAY"
+
+    # Summary-Zeile
+    # Rcpts sammeln
+    out_rcpts=""
+    if (id in rcpts){
+      for (r in rcpts[id]) {
+        out_rcpts = (out_rcpts=="" ? r : out_rcpts ", " r)
+      }
+    }
+    printf "[%s] ID=%s | First=%s | From=%s | Rcpts=%s | Delivered=%d Deferred=%d Failed=%d\n",
+      status_txt, id, first_ts[id], (from_addr[id] ? from_addr[id] : "(?)"), (out_rcpts=="" ? "(?)" : out_rcpts), d, e, f
+
+    # Marker-Hinweis
+    if (fail_marker[id]) {
+      printf "  Note: DELIVERY STALL erkannt: '\''all hosts for domain failing (retry/backoff)'\''\n"
+    }
+
+    # Detailblock
+    print sep
+    printf "ID:        %s\n", id
+    printf "First:     %s\n", first_ts[id]
+    printf "Last:      %s\n", last_ts[id]
+    printf "From:      %s\n", (from_addr[id] ? from_addr[id] : "(unbekannt)")
+    printf "Rcpts:     %s\n", (out_rcpts=="" ? "(unbekannt)" : out_rcpts)
+    printf "Status:    %s (Delivered=%d, Deferred=%d, Failed=%d)\n", status_txt, d, e, f
+    print "Log:"
+    print status[id]
+    print sep
+  }
+}
+
+# Built with the help of Claude Code
\ No newline at end of file
diff --git a/legacy/exitrace/lib/mx_lookup.sh b/legacy/exitrace/lib/mx_lookup.sh
new file mode 100644
index 0000000..7fde1bc
--- /dev/null
+++ b/legacy/exitrace/lib/mx_lookup.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# mx_lookup.sh - MX record lookup functions for exitrace
+# Maintainer: ljp
+
+# MX record lookup with A/AAAA resolution
+show_mx_records() {
+  local domain="$1"
+  
+  if ! command -v dig >/dev/null 2>&1; then
+    echo "(Hinweis) dig nicht gefunden, MX-Ausgabe übersprungen." >&2
+    return 1
+  fi
+  
+  echo "== MX für ${domain} =="
+  dig +short MX "$domain" | sort -n || {
+    echo "Fehler: MX-Abfrage für $domain fehlgeschlagen" >&2
+    return 1
+  }
+  
+  echo "-- A/AAAA der MX:"
+  while read -r mx; do
+    [[ -n "$mx" ]] || continue
+    local host="${mx#* }"
+    printf "%-35s | " "$host"
+    
+    # A records
+    local a_records
+    a_records="$(dig +short A "$host" 2>/dev/null | paste -sd, -)"
+    printf "%s" "${a_records:-"-"}"
+    
+    printf " | "
+    
+    # AAAA records  
+    local aaaa_records
+    aaaa_records="$(dig +short AAAA "$host" 2>/dev/null | paste -sd, -)"
+    printf "%s\n" "${aaaa_records:-"-"}"
+    
+  done < <(dig +short MX "$domain" | sort -n)
+  
+  echo "========================================================================"
+}
+
+# Built with the help of Claude Code
\ No newline at end of file