diff --git a/scripts/discover_dom.py b/scripts/discover_dom.py
new file mode 100644
index 0000000..d25355f
--- /dev/null
+++ b/scripts/discover_dom.py
@@ -0,0 +1,58 @@
+"""Run this script once with a Teams meeting chat open.
+It prints DOM info to identify selectors for messages and profile cards.
+
+Usage:
+    .venv/bin/python scripts/discover_dom.py [teams-chat-url]
+"""
+import sys
+from pathlib import Path
+from playwright.sync_api import sync_playwright
+
+URL = sys.argv[1] if len(sys.argv) > 1 else "https://teams.microsoft.com"
+SESSION_DIR = str(Path.home() / ".teampulse" / "session")
+
+
+def main():
+    with sync_playwright() as p:
+        browser = p.chromium.launch_persistent_context(
+            SESSION_DIR,
+            headless=False,
+            args=["--no-sandbox"],
+        )
+        page = browser.pages[0] if browser.pages else browser.new_page()
+        page.goto(URL)
+        print("Navigiere im Browser zu einem Meeting-Chat, dann hier Enter drücken...")
+        input()
+
+        candidates = page.query_selector_all(
+            "[data-tid*='message'], [class*='message'], [role='listitem']"
+        )
+        print(f"\n{len(candidates)} potenzielle Nachrichten-Elemente gefunden")
+        for i, el in enumerate(candidates[:5]):
+            print(f"\n--- Element {i} ---")
+            print(f"  tag:              {el.evaluate('e => e.tagName')}")
+            print(f"  data-tid:         {el.get_attribute('data-tid')}")
+            print(f"  class (100 Zch):  {(el.get_attribute('class') or '')[:100]}")
+            print(f"  text  (100 Zch):  {el.inner_text()[:100].replace(chr(10), ' ')}")
+
+        print("\nKlicke im Browser auf einen Sender-Namen, dann hier Enter drücken...")
+        input()
+
+        cards = page.query_selector_all(
+            "[class*='persona'], [class*='Persona'], [class*='profile'], [data-tid*='persona']"
+        )
+        print(f"\n{len(cards)} potenzielle Profilkarten-Elemente gefunden")
+        for i, el in enumerate(cards[:5]):
+            print(f"\n--- Karte {i} ---")
+            print(f"  tag:              {el.evaluate('e => e.tagName')}")
+            print(f"  data-tid:         {el.get_attribute('data-tid')}")
+            print(f"  class (100 Zch):  {(el.get_attribute('class') or '')[:100]}")
+            print(f"  text  (100 Zch):  {el.inner_text()[:100].replace(chr(10), ' ')}")
+
+        print("\nEnter zum Schließen...")
+        input()
+        browser.close()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/teampulse/resolver.py b/src/teampulse/resolver.py
index dfef0b9..7da4d0d 100644
--- a/src/teampulse/resolver.py
+++ b/src/teampulse/resolver.py
@@ -1,8 +1,11 @@
 import json
+import time
 from pathlib import Path
 
 from playwright.sync_api import Page
 
+from teampulse.monitor import _PROFILE_EMAIL_SELECTOR, _SENDER_SELECTOR
+
 
 class Resolver:
     def __init__(self, cache_path: Path, page: Page):
@@ -34,5 +37,26 @@ class Resolver:
         )
 
     def _extract_email_from_profile(self, display_name: str) -> str | None:
-        # Implemented in Task 8 — browser interaction with Teams profile cards
-        raise NotImplementedError
+        sender_elements = self._page.query_selector_all(_SENDER_SELECTOR)
+        target = None
+        for el in sender_elements:
+            if el.inner_text().strip() == display_name:
+                target = el
+                break
+
+        if target is None:
+            print(f"  Sender '{display_name}' nicht im Chat gefunden.")
+            return None
+
+        try:
+            target.click()
+            self._page.wait_for_selector(_PROFILE_EMAIL_SELECTOR, timeout=5000)
+            email_el = self._page.query_selector(_PROFILE_EMAIL_SELECTOR)
+            email = email_el.inner_text().strip() if email_el else None
+            self._page.keyboard.press("Escape")
+            time.sleep(0.5)
+            return email
+        except Exception as e:
+            print(f"  Profilkarte für '{display_name}' nicht ladbar: {e}")
+            self._page.keyboard.press("Escape")
+            return None