diff --git a/app/Http/Controllers/ESign/EsignApiController.php b/app/Http/Controllers/ESign/EsignApiController.php
index b44ab260..49b387fa 100644
--- a/app/Http/Controllers/ESign/EsignApiController.php
+++ b/app/Http/Controllers/ESign/EsignApiController.php
@@ -760,7 +760,7 @@ public function send(Request $request, int $id): JsonResponse
             return response()->json(['success' => false, 'message' => '초안 상태에서만 발송할 수 있습니다.'], 422);
         }
 
-        $sendMethod = $request->input('send_method', 'alimtalk');
+        $sendMethod = $request->input('send_method', 'email');
         $smsFallback = $request->boolean('sms_fallback', true);
 
         $contract->update([
@@ -848,7 +848,7 @@ public function remind(Request $request, int $id): JsonResponse
             $nextSigner->update(['status' => 'notified']);
             $results = $this->dispatchNotification(
                 $contract, $nextSigner,
-                $contract->send_method ?? 'alimtalk',
+                $contract->send_method ?? 'email',
                 $contract->sms_fallback ?? true,
                 isReminder: true,
             );
@@ -908,26 +908,34 @@ private function dispatchNotification(
         bool $isReminder = false,
     ): array {
         $results = [];
+        $alimtalkFailed = false;
 
         // 알림톡 발송
         if (in_array($sendMethod, ['alimtalk', 'both']) && $signer->phone) {
-            $results[] = $this->sendAlimtalk($contract, $signer, $smsFallback, $isReminder);
+            $alimtalkResult = $this->sendAlimtalk($contract, $signer, $smsFallback, $isReminder);
+            $results[] = $alimtalkResult;
+            $alimtalkFailed = !($alimtalkResult['success'] ?? false);
         }
 
-        // 이메일 발송 (email/both 선택 시, 또는 알림톡인데 번호 없으면 폴백)
-        if (in_array($sendMethod, ['email', 'both']) || ($sendMethod === 'alimtalk' && !$signer->phone)) {
-            if ($signer->email) {
-                try {
-                    Mail::to($signer->email)->send(new EsignRequestMail($contract, $signer, $isReminder));
-                    $results[] = ['success' => true, 'channel' => 'email', 'error' => null];
-                } catch (\Throwable $e) {
-                    \Log::warning('E-Sign 이메일 발송 실패', [
-                        'contract_id' => $contract->id,
-                        'signer_id' => $signer->id,
-                        'error' => $e->getMessage(),
-                    ]);
-                    $results[] = ['success' => false, 'channel' => 'email', 'error' => $e->getMessage()];
-                }
+        // 이메일 발송 조건:
+        // 1) email/both 선택 시
+        // 2) alimtalk인데 번호 없으면 폴백
+        // 3) alimtalk 발송 실패 시 이메일 자동 폴백
+        $shouldSendEmail = in_array($sendMethod, ['email', 'both'])
+            || ($sendMethod === 'alimtalk' && !$signer->phone)
+            || ($sendMethod === 'alimtalk' && $alimtalkFailed);
+
+        if ($shouldSendEmail && $signer->email) {
+            try {
+                Mail::to($signer->email)->send(new EsignRequestMail($contract, $signer, $isReminder));
+                $results[] = ['success' => true, 'channel' => 'email', 'error' => null];
+            } catch (\Throwable $e) {
+                \Log::warning('E-Sign 이메일 발송 실패', [
+                    'contract_id' => $contract->id,
+                    'signer_id' => $signer->id,
+                    'error' => $e->getMessage(),
+                ]);
+                $results[] = ['success' => false, 'channel' => 'email', 'error' => $e->getMessage()];
             }
         }
 
@@ -949,6 +957,10 @@ private function sendAlimtalk(
                 return ['success' => false, 'channel' => 'alimtalk', 'error' => '바로빌 회원 미등록'];
             }
 
+            if (!$member->corp_num) {
+                return ['success' => false, 'channel' => 'alimtalk', 'error' => '사업자번호 미설정 (알림톡 발송 불가)'];
+            }
+
             $barobill = app(BarobillService::class);
             $barobill->setServerMode($member->is_test_mode ? 'test' : 'production');
 
diff --git a/resources/views/esign/send.blade.php b/resources/views/esign/send.blade.php
index 5269a2a7..5e258ffb 100644
--- a/resources/views/esign/send.blade.php
+++ b/resources/views/esign/send.blade.php
@@ -23,16 +23,16 @@
 });
 
 const SEND_METHODS = [
-    { value: 'alimtalk', label: '카카오톡 알림톡', desc: '수신자 휴대폰으로 알림톡 발송 (카카오톡 미사용 시 SMS 자동 대체)', icon: '💬', recommended: true },
-    { value: 'email', label: '이메일', desc: '수신자 이메일로 발송', icon: '✉' },
-    { value: 'both', label: '알림톡 + 이메일 (동시)', desc: '두 채널 모두 발송하여 확인율 극대화', icon: '📡' },
+    { value: 'email', label: '이메일', desc: '수신자 이메일로 서명 요청 링크 발송', icon: '✉', recommended: true },
+    { value: 'alimtalk', label: '카카오톡 알림톡', desc: '수신자 휴대폰으로 알림톡 발송 (카카오 채널 개설 후 사용 가능)', icon: '💬', disabled: true },
+    { value: 'both', label: '알림톡 + 이메일 (동시)', desc: '두 채널 모두 발송하여 확인율 극대화 (카카오 채널 개설 후 사용 가능)', icon: '📡', disabled: true },
 ];
 
 const App = () => {
     const [contract, setContract] = useState(null);
     const [loading, setLoading] = useState(true);
     const [sending, setSending] = useState(false);
-    const [sendMethod, setSendMethod] = useState('alimtalk');
+    const [sendMethod, setSendMethod] = useState('email');
     const [smsFallback, setSmsFallback] = useState(true);
 
     const fetchContract = useCallback(async () => {
@@ -113,15 +113,17 @@
                 <div className="space-y-3">
                     {SEND_METHODS.map(m => (
                         <label key={m.value}
-                               className={`flex items-start gap-3 p-3 rounded-lg border-2 cursor-pointer transition ${sendMethod === m.value ? 'border-blue-500 bg-blue-50' : 'border-gray-200 hover:border-gray-300'}`}>
+                               className={`flex items-start gap-3 p-3 rounded-lg border-2 transition ${m.disabled ? 'cursor-not-allowed opacity-50' : 'cursor-pointer'} ${sendMethod === m.value ? 'border-blue-500 bg-blue-50' : 'border-gray-200 hover:border-gray-300'}`}>
                             <input type="radio" name="send_method" value={m.value}
                                    checked={sendMethod === m.value}
-                                   onChange={() => setSendMethod(m.value)}
+                                   onChange={() => !m.disabled && setSendMethod(m.value)}
+                                   disabled={m.disabled}
                                    className="mt-1 text-blue-600 focus:ring-blue-500" />
                             <div className="flex-1">
                                 <div className="flex items-center gap-2">
                                     <span className="text-sm font-medium text-gray-900">{m.icon} {m.label}</span>
                                     {m.recommended && <span className="px-1.5 py-0.5 text-xs font-medium bg-yellow-100 text-yellow-700 rounded">권장</span>}
+                                    {m.disabled && <span className="px-1.5 py-0.5 text-xs font-medium bg-gray-100 text-gray-500 rounded">준비중</span>}
                                 </div>
                                 <p className="text-xs text-gray-500 mt-0.5">{m.desc}</p>
                             </div>