diff --git a/src/api/main.py b/src/api/main.py
index 0dfea57..5c803ed 100644
--- a/src/api/main.py
+++ b/src/api/main.py
@@ -10,7 +10,7 @@ Benutzernamen im Remote-User-Header mitschickt."""
 import json
 import logging
 import secrets
-from datetime import date, datetime
+from datetime import datetime
 from urllib.parse import quote_plus
 
 from fastapi import Depends, FastAPI, Query, Request
@@ -424,7 +424,6 @@ def admin_test_send(
     if not is_admin:
         return RedirectResponse(url="/", status_code=303)
 
-    target = date(2026, 8, 6)
     try:
         Config.validate_mailer()
     except RuntimeError as exc:
@@ -453,9 +452,22 @@ def admin_test_send(
             status_code=400,
         )
 
-    sent_count = 0
-    errors = []
     with db.get_connection() as conn:
+        target = db.get_most_common_birthday(conn)
+        if target is None:
+            return templates.TemplateResponse(
+                "admin.html",
+                {
+                    "request": request,
+                    "current_user": current_user,
+                    "show_all": request.session.get("show_all", False),
+                    "error": "Keine Kontakte mit Geburtstag in der Datenbank",
+                },
+                status_code=400,
+            )
+
+        sent_count = 0
+        errors = []
         for account in mail_accounts:
             birthdays = fetch_todays_birthdays_for_account(conn, account.name, target)
             if not birthdays:
diff --git a/src/api/templates/admin.html b/src/api/templates/admin.html
index cb262ce..006ef8c 100644
--- a/src/api/templates/admin.html
+++ b/src/api/templates/admin.html
@@ -227,10 +227,10 @@
         <div class="card">
             <div class="card-title">E-Mail-Test</div>
             <form method="post" action="/admin/test-send">
-                <button type="submit" class="btn">Test-Geburtstagsmail senden (06.08.)</button>
+                <button type="submit" class="btn">Test-Geburtstagsmail senden</button>
             </form>
             <div class="test-info">
-                Sendet eine Test-Geburtstagsmail an die im Account hinterlegte Adresse (birthday_mail_to) mit allen Kontakten, die am 6. August Geburtstag haben. Das Layout entspricht der täglichen Geburtstagsmail.
+                Sendet eine Test-Geburtstagsmail an die im Account hinterlegte Adresse (birthday_mail_to) mit allen Kontakten, die am beliebtesten Geburtstag haben. Das Layout entspricht der täglichen Geburtstagsmail.
             </div>
         </div>
     </div>
diff --git a/src/db.py b/src/db.py
index af1b69d..1aedc80 100644
--- a/src/db.py
+++ b/src/db.py
@@ -5,7 +5,7 @@ import logging
 import os
 import uuid
 from contextlib import contextmanager
-from datetime import datetime, timezone
+from datetime import date, datetime, timezone
 
 import pymysql
 from pymysql.cursors import DictCursor
@@ -231,6 +231,22 @@ def search_contacts_without_social(conn, account: str | None) -> list[dict]:
         return cur.fetchall()
 
 
+def get_most_common_birthday(conn) -> date | None:
+    with conn.cursor() as cur:
+        cur.execute(
+            """SELECT MONTH(birthday) AS m, DAY(birthday) AS d, COUNT(*) AS cnt
+               FROM contacts
+               WHERE birthday IS NOT NULL
+               GROUP BY m, d
+               ORDER BY cnt DESC
+               LIMIT 1"""
+        )
+        row = cur.fetchone()
+    if not row:
+        return None
+    return date(datetime.now().year, row["m"], row["d"])
+
+
 def get_upcoming_birthdays(conn, account: str | None, days: int = 7) -> list[dict]:
     where_clause, params = _account_filter_clause(account)
     today = datetime.now(Config.TIMEZONE).date()