diff --git a/frontend/src/pages/contracts/ContractForm.tsx b/frontend/src/pages/contracts/ContractForm.tsx
index 8df2bf6a..30813fd2 100644
--- a/frontend/src/pages/contracts/ContractForm.tsx
+++ b/frontend/src/pages/contracts/ContractForm.tsx
@@ -15,7 +15,7 @@ import { buildContractLabelParts } from '../../utils/contractLabel';
 import type { ContractType } from '../../types';
 import { formatDate } from '../../utils/dateFormat';
 import { useProviderSettings } from '../../hooks/useProviderSettings';
-import { Plus, Trash2, Eye, EyeOff, Info, X, ArrowLeft, ExternalLink } from 'lucide-react';
+import { Plus, Trash2, Eye, EyeOff, Info, X, ArrowLeft, ExternalLink, Mail } from 'lucide-react';
 
 // Kleine Helper-Komponente: Label + Mini-Link im neuen Tab. Wird neben
 // Select-Feldern eingesetzt, deren Stammdaten an anderer Stelle gepflegt
@@ -1116,15 +1116,43 @@ export default function ContractForm() {
                   <span className="text-sm">{customerEmailLabel} Adresse</span>
                 </label>
                 {usernameType === 'stressfrei' && (
-                  <Select
-                    value={selectedStressfreiEmailId}
-                    onChange={(e) => setSelectedStressfreiEmailId(e.target.value)}
-                    options={stressfreiEmails.map((e: { id: number; email: string; notes?: string }) => ({
-                      value: e.id,
-                      label: e.email + (e.notes ? ` (${e.notes})` : ''),
-                    }))}
-                    placeholder={stressfreiEmails.length === 0 ? 'Keine Stressfrei-Adressen vorhanden' : 'Adresse auswählen...'}
-                  />
+                  <div className="flex items-start gap-2">
+                    <div className="flex-1 min-w-0">
+                      <Select
+                        value={selectedStressfreiEmailId}
+                        onChange={(e) => setSelectedStressfreiEmailId(e.target.value)}
+                        options={stressfreiEmails.map((e: { id: number; email: string; notes?: string }) => ({
+                          value: e.id,
+                          label: e.email + (e.notes ? ` (${e.notes})` : ''),
+                        }))}
+                        placeholder={stressfreiEmails.length === 0 ? 'Keine Stressfrei-Adressen vorhanden' : 'Adresse auswählen...'}
+                      />
+                    </div>
+                    {customerId && (
+                      <div className="flex items-center gap-1 pt-1.5 flex-shrink-0">
+                        <a
+                          href={`/customers/${customerId}?tab=stressfrei`}
+                          target="_blank"
+                          rel="noopener noreferrer"
+                          title={`${customerEmailLabel} Adressen des Kunden in neuem Tab öffnen`}
+                          aria-label={`${customerEmailLabel} Adressen des Kunden in neuem Tab öffnen`}
+                          className="text-gray-400 hover:text-blue-600 p-1 rounded"
+                        >
+                          <ExternalLink className="w-4 h-4" />
+                        </a>
+                        <a
+                          href={`/customers/${customerId}?tab=emails`}
+                          target="_blank"
+                          rel="noopener noreferrer"
+                          title="E-Mail-Postfach des Kunden in neuem Tab öffnen"
+                          aria-label="E-Mail-Postfach des Kunden in neuem Tab öffnen"
+                          className="text-gray-400 hover:text-blue-600 p-1 rounded"
+                        >
+                          <Mail className="w-4 h-4" />
+                        </a>
+                      </div>
+                    )}
+                  </div>
                 )}
                 {usernameType === 'stressfrei' && stressfreiEmails.length === 0 && (
                   <p className="text-xs text-amber-600">