diff --git a/background.js b/background.js
index 289757c..1a6ccb2 100644
--- a/background.js
+++ b/background.js
@@ -603,6 +603,11 @@ function isRetryableContentScriptTransportError(error) {
   return /back\/forward cache|message channel is closed|Receiving end does not exist|port closed before a response was received|A listener indicated an asynchronous response/i.test(message);
 }
 
+function isRestartCurrentAttemptError(error) {
+  const message = String(typeof error === 'string' ? error : error?.message || '');
+  return /当前邮箱已存在，需要重新开始新一轮/.test(message);
+}
+
 function isStepDoneStatus(status) {
   return status === 'completed' || status === 'manual_completed' || status === 'skipped';
 }
@@ -1297,7 +1302,8 @@ async function autoRunLoop(totalRuns, options = {}) {
   const resumeCurrentRun = Number.isInteger(options.resumeCurrentRun) ? options.resumeCurrentRun : 0;
   const resumeSuccessfulRuns = Number.isInteger(options.resumeSuccessfulRuns) ? options.resumeSuccessfulRuns : 0;
   const resumeAttemptRunsProcessed = Number.isInteger(options.resumeAttemptRunsProcessed) ? options.resumeAttemptRunsProcessed : 0;
-  const maxAttempts = autoRunSkipFailures ? Math.max(totalRuns * 10, totalRuns + 20) : totalRuns;
+  let maxAttempts = autoRunSkipFailures ? Math.max(totalRuns * 10, totalRuns + 20) : totalRuns;
+  const forcedRetryCap = Math.max(totalRuns * 10, totalRuns + 20);
   let successfulRuns = Math.max(0, resumeSuccessfulRuns);
   let attemptRuns = Math.max(0, resumeAttemptRunsProcessed);
   let forceFreshTabsNextRun = false;
@@ -1392,6 +1398,20 @@ async function autoRunLoop(totalRuns, options = {}) {
         break;
       }
 
+      if (isRestartCurrentAttemptError(err)) {
+        await addLog(`目标 ${targetRun}/${totalRuns} 轮检测到当前邮箱已存在，当前线程已放弃，将重新开始新一轮。`, 'warn');
+        cancelPendingCommands('当前线程因邮箱已存在而放弃。');
+        await broadcastStopToContentScripts();
+        await broadcastAutoRunStatus('retrying', {
+          currentRun: targetRun,
+          totalRuns,
+          attemptRun: attemptRuns,
+        });
+        forceFreshTabsNextRun = true;
+        maxAttempts = Math.max(maxAttempts, Math.min(forcedRetryCap, attemptRuns + 1));
+        continue;
+      }
+
       if (!autoRunSkipFailures) {
         await addLog(`目标 ${targetRun}/${totalRuns} 轮失败：${err.message}`, 'error');
         await broadcastAutoRunStatus('stopped', {
diff --git a/content/signup-page.js b/content/signup-page.js
index 0992357..338fe0e 100644
--- a/content/signup-page.js
+++ b/content/signup-page.js
@@ -359,6 +359,7 @@ const ADD_PHONE_PAGE_PATTERN = /add[\s-]*phone|添加手机号|手机号码|手
 const STEP5_SUBMIT_ERROR_PATTERN = /无法根据该信息创建帐户|请重试|unable\s+to\s+create\s+(?:your\s+)?account|couldn'?t\s+create\s+(?:your\s+)?account|something\s+went\s+wrong|invalid\s+(?:birthday|birth|date)|生日|出生日期/i;
 const SIGNUP_PASSWORD_ERROR_TITLE_PATTERN = /糟糕，出错了|something\s+went\s+wrong|oops/i;
 const SIGNUP_PASSWORD_ERROR_DETAIL_PATTERN = /operation\s+timed\s+out|timed\s+out|请求超时|操作超时/i;
+const SIGNUP_EMAIL_EXISTS_PATTERN = /与此电子邮件地址相关联的帐户已存在|account\s+associated\s+with\s+this\s+email\s+address\s+already\s+exists|email\s+address.*already\s+exists/i;
 
 function getVerificationErrorText() {
   const messages = [];
@@ -609,6 +610,10 @@ function isSignupPasswordErrorPage() {
   );
 }
 
+function isSignupEmailAlreadyExistsPage() {
+  return isSignupPasswordPage() && SIGNUP_EMAIL_EXISTS_PATTERN.test(getPageTextSnapshot());
+}
+
 function inspectSignupVerificationState() {
   if (isStep5Ready()) {
     return { state: 'step5' };
@@ -625,6 +630,10 @@ function inspectSignupVerificationState() {
     };
   }
 
+  if (isSignupEmailAlreadyExistsPage()) {
+    return { state: 'email_exists' };
+  }
+
   const passwordInput = getSignupPasswordInput();
   if (passwordInput) {
     return {
@@ -644,7 +653,7 @@ async function waitForSignupVerificationTransition(timeout = 5000) {
     throwIfStopped();
 
     const snapshot = inspectSignupVerificationState();
-    if (snapshot.state === 'step5' || snapshot.state === 'verification' || snapshot.state === 'error') {
+    if (snapshot.state === 'step5' || snapshot.state === 'verification' || snapshot.state === 'error' || snapshot.state === 'email_exists') {
       return snapshot;
     }
 
@@ -677,6 +686,10 @@ async function prepareSignupVerificationFlow(payload = {}, timeout = 30000) {
       return { ready: true, retried: recoveryRound };
     }
 
+    if (snapshot.state === 'email_exists') {
+      throw new Error('当前邮箱已存在，需要重新开始新一轮。');
+    }
+
     recoveryRound += 1;
 
     if (snapshot.state === 'error') {