diff --git a/index.html b/index.html
index cc033a6..23b9a6f 100644
--- a/index.html
+++ b/index.html
@@ -100,18 +100,21 @@
             </div>
         </div>
         <br>
-        <label for="slice" class="pure-checkbox">
-            <input id="slice" type="checkbox"/> Enable task slicing
-        </label>
         <label for="greet" class="pure-checkbox">
             <input id="greet" type="checkbox"/> Greet recipients (by proper names if possible)
         </label>
-        <label for="save" class="pure-checkbox">
-            <input id="save" type="checkbox" checked/> Save to file upon exit
+        <label for="recovery" class="pure-checkbox">
+            <input id="recovery" type="checkbox"/> Try recover from a mismatched subject error
+        </label>
+        <label for="slice" class="pure-checkbox">
+            <input id="slice" type="checkbox"/> Enable task slicing
         </label>
         <label for="nospam" class="pure-checkbox">
             <input id="nospam" type="checkbox"/> Avoid spamming
         </label>
+        <label for="save" class="pure-checkbox">
+            <input id="save" type="checkbox" checked/> Save to file upon exit
+        </label>
     </fieldset>
     <br>
     <fieldset>
@@ -249,8 +252,18 @@ $$$('#send', 'click', async (e) => {
             break;
         default:
             try {
+                let PickerOptions = {
+                    types: [
+                        {
+                            description: "Excel Spreadsheet",
+                            accept: {
+                                "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet": ['.xlsx']
+                            }
+                        }
+                    ]
+                };
                 $('#send > span.icon').classList.remove('hidden');
-                let [handle] = await showOpenFilePicker();
+                let [handle] = await showOpenFilePicker(PickerOptions);
                 let file = await handle.getFile();
 
                 let buffer = await new Promise((resolve, reject) => {
@@ -265,7 +278,7 @@ $$$('#send', 'click', async (e) => {
                 Status = 'READY';
 
                 $('#fileLabel').innerHTML = file.name;
-                $('#uptimeLabel').dataset.timestamp = dayjs().unix();
+                $('#uptimeLabel').dataset.seconds = 0;
                 $('#send > span.text').innerHTML = 'Send';
                 $('#cancel').disabled = false;
                 $('#send').disabled = true;
@@ -420,10 +433,13 @@ function main(url, parameters, locales) {
                 $('#cancel').disabled = false;
                 break;
             case 'setProgress':
-                let [sent, name, recipient] = args;
+                let [index, name, recipient, sent, warnings, errors] = args;
                 let label = name ? `${name} <${recipient}>` : recipient;
                 $('#recipientLabel').innerHTML = label;
                 $('#progressLabel').dataset.sent = sent;
+                $('#progressLabel').dataset.index = index;
+                $('#progressLabel').dataset.errors = errors;
+                $('#progressLabel').dataset.warnings = warnings;
                 break;
             case 'setStatus':
                 switch (args[0]) {
@@ -443,7 +459,8 @@ function main(url, parameters, locales) {
                         $('#send > span.icon').classList.add('hidden');
                         break;
                     case 'FINISH':
-                        alert('任务结束')
+                        let {sent, warnings, errors} = $('#progressLabel').dataset;
+                        alert(`${sent||0} Sent; ${warnings||0} Warning(s); ${errors||0} Error(s)`);
                     case 'CANCEL':
                         Status = null;
                         $('#send > span.text').innerHTML = 'Open';
@@ -488,21 +505,19 @@ function main(url, parameters, locales) {
         $('#statusLabel').innerHTML = Status ? Status.charAt(0).toUpperCase() + Status.slice(1).toLowerCase() : 'Idle';
 
         if (Status === 'RUNNING') {
-            let sent = Number($('#progressLabel').dataset.sent) || 0;
+            let index = Number($('#progressLabel').dataset.index) || 0;
             let limit = Number($('#subcategory').dataset.limit) || Limit;
-            let percentage = parseFloat((sent / limit * 100).toFixed(2));
-            $('#progressLabel').innerHTML = `${sent} / ${limit} (${percentage} %)`;
-
-            let timestamp = Number($('#uptimeLabel').dataset.timestamp);
-            let uptime = dayjs.duration(dayjs().diff(dayjs.unix(timestamp)));
-            let rate = sent / uptime.asSeconds();
+            let percentage = parseFloat((index / limit * 100).toFixed(2));
+            $('#progressLabel').innerHTML = `${index} / ${limit} (${percentage} %)`;
 
+            let uptime = dayjs.duration($('#uptimeLabel').dataset.seconds, 'second');
+            let rate = Number($('#progressLabel').dataset.sent) / uptime.asSeconds();
             let spm = parseFloat(Number(rate*60).toFixed(2));
-            let speed = spm >= 1 ? `${spm} per minute` : null;
-            let remaining = rate > 0 ? dayjs.duration((limit - sent) / rate, 'second').humanize() : null;
 
-            $('#remainingLabel').innerHTML = [remaining, speed].filter((x) => x).join(' - ');
+            $('#remainingLabel').innerHTML = rate > 0 ? `<span>${dayjs.duration((limit - index) / rate, 'second').humanize()}</span>` : '';
+            $('#remainingLabel').innerHTML += spm >= 1 ? `<span class="${spm > 8.33 ? 'rate warning' : 'rate'}">${spm} per minute</span>` : '';
             $('#uptimeLabel').innerHTML = uptime.format("HH:mm:ss");
+            $('#uptimeLabel').dataset.seconds = uptime.asSeconds() + 1;
         }
     }, 1000);
 }
@@ -525,6 +540,12 @@ label {
     width: fit-content;
 }
 
+.rate:not(:first-child)::before {
+    padding: 0em 0.4em;
+    content: '–';
+    color: #666;
+}
+
 .inline-flex {
     display: inline-flex;
     align-items: center;
@@ -536,6 +557,10 @@ label {
     white-space: nowrap;
 }
 
+.warning {
+    color: orangered;
+}
+
 .hidden {
     display: none;
 }
diff --git a/main.py b/main.py
index 0ff4a0c..1bf34bf 100644
--- a/main.py
+++ b/main.py
@@ -47,7 +47,6 @@ args = parser.parse_args()
 inbox, outbox = Queue(), Queue()
 connection = None
 socket = None
-server = None
 
 sent = 0
 errors = 0
@@ -84,8 +83,8 @@ class Command:
         return json.dumps(pack)
 
 def tell(message, exception=None, level=2):
-    if exception is not None: message = ': '.join([message, exception.__class__.__name__])
-    elif isinstance(exception, Exception): message += '\n' + ''.join(traceback.format_exception(exception))
+    message = ': '.join(filter(None, [message, exception.__class__.__name__ if isinstance(exception, Exception) else exception]))
+    if isinstance(exception, Exception): message += '\n' + ''.join(traceback.format_exception(exception))
 
     if not outbox.is_shutdown:
         outbox.put(Command('tell', message, level))
@@ -143,9 +142,9 @@ def main(driver: WebDriver):
             except TimeoutException: continue
             except: break
 
-    def ready(driver, predicate):
+    def ready(driver, predicate=lambda x: x.find_element(By.CSS_SELECTOR, ".io-ox-busy")):
         try:
-            wait = WebDriverWait(driver, timeout=parameters.get('timeout'))
+            wait = WebDriverWait(driver, timeout=parameters.get('interval'))
             wait.until(predicate, '操作超时')
         except:
             return True
@@ -198,11 +197,12 @@ def main(driver: WebDriver):
         except: continue
 
     try:
+        condition = EC.presence_of_element_located
         # 打开草稿箱
-        click("li[data-id='default0/Brouillons']", condition=EC.presence_of_element_located)
-        click("button[data-id='default0/Brouillons']", condition=EC.presence_of_element_located)
+        click("li[data-id='default0/Brouillons']", condition)
+        click("button[data-id='default0/Brouillons']", condition)
         # 打开邮件
-        click("ul[aria-label='List view'] li[data-index='0']", condition=EC.presence_of_element_located)
+        click("ul[aria-label='List view'] li[data-index='0']", condition)
     except Exception as e:
         tell('打开草稿邮件时发生错误', e, level=1)
         pass
@@ -341,7 +341,7 @@ def main(driver: WebDriver):
             mark = sents[current]
 
             occurrence = occurrences.setdefault(code, [0]) if code else [0]
-            outbox.put(Command('setProgress', index, name, recipient))
+            outbox.put(Command('setProgress', index, name, recipient, sent, warnings, errors))
 
             if mark is not None and str(mark).strip():
                 tell(f'已跳过项目 {recipient}')
@@ -362,11 +362,32 @@ def main(driver: WebDriver):
 
                     if (target := get_address()) != address:
                         raise Exception(f'邮件发件地址与设定不一致\n>> {address}\n>> {target}')
+                    
                     if (target := get_subject()) != subject:
-                        raise Exception(f'邮件主题与设定不一致\n>> {subject}\n>> {target}')
+                        exception = Exception(f'邮件主题与设定不一致\n>> {subject}\n>> {target}')
+                        condition = EC.presence_of_element_located
+                        if not parameters.get('recovery'): raise exception
+                        # 打开存档
+                        click("li[data-id='default0/Archives'] li.folder:nth-child(1)", condition)
+                        ready(driver)
+                        click("ul[aria-label='List view'] li[data-index='0']", condition)
+                        click("ul.classic-toolbar button[aria-label='More actions']", condition)
+                        # 复制邮件
+                        click(".abs + ul.dropdown-menu a[data-action='io.ox/mail/actions/copy']", condition)
+                        click(".modal-dialog ul.subfolders li[data-id='default0/Brouillons']", condition)
+                        click(".modal-dialog .modal-footer button[data-action='ok']", condition)
+                        # 返回草稿箱
+                        click("li[data-id='default0/Brouillons']")
+                        ready(driver)
 
-                    click("button[aria-label='Edit copy']")
-                    ready(driver, lambda x: x.find_element(By.CSS_SELECTOR, ".io-ox-busy"))
+                        for attempt in range(parameters.get('retry')):
+                            click("ul[aria-label='List view'] li[data-index='0']", condition)
+                            if get_subject() == subject: break
+                            time.sleep(parameters.get('interval'))
+                        if not get_subject() == subject: raise exception
+
+                    click("ul.classic-toolbar button[aria-label='Edit copy']")
+                    ready(driver)
                     locate("div.io-ox-mail-compose-window iframe", condition=EC.frame_to_be_available_and_switch_to_it)
 
                     if parameters.get('greet') and greetings and timezone:
@@ -516,7 +537,7 @@ async def handler(request: ws.WebSocketRequest):
     inbox.shutdown(immediate=True)
 
 async def backend(listen='127.0.0.1', port=0):
-    global server, socket
+    global socket
     listeners = await trio.open_tcp_listeners(port, host=listen)
     server = ws.WebSocketServer(handler, listeners, max_message_size=125_000_000)
     socket = listeners[0].socket