diff --git a/smtp_proxy_server/imap_server.py b/smtp_proxy_server/imap_server.py
index 556cfe0d..9759054e 100644
--- a/smtp_proxy_server/imap_server.py
+++ b/smtp_proxy_server/imap_server.py
@@ -51,6 +51,9 @@ class SimpleMessage:
     def getFlags(self):
         return ["\\Seen"]
 
+    def getInternalDate(self):
+        return self.email.headers.get("Date", "Mon, 1 Jan 1900 00:00:00 +0000")
+
 
 @implementer(imap4.IMailboxInfo, imap4.IMailbox)
 class SimpleMailbox:
@@ -129,7 +132,7 @@ class SimpleMailbox:
 
     def store(self, messages, flags, mode, uid):
         # IMailboxIMAP.store
-        pass
+        raise NotImplementedError
 
 
 class Account(imap4.MemoryAccount):
@@ -141,7 +144,7 @@ class Account(imap4.MemoryAccount):
     def _emptyMailbox(self, name, id):
         _logger.info(f"New mailbox: {name}, {id}")
         if name != "INBOX":
-            raise imap4.NoSuchMailbox(name)
+            raise Exception("Mailbox not found")
         return SimpleMailbox(self.password)
 
     def select(self, name, rw=1):
diff --git a/smtp_proxy_server/smtp_server.py b/smtp_proxy_server/smtp_server.py
index 8436ad46..bd9a0c8a 100644
--- a/smtp_proxy_server/smtp_server.py
+++ b/smtp_proxy_server/smtp_server.py
@@ -41,20 +41,33 @@ class CustomSMTPHandler:
             for part in msg.walk():
                 content_type = part.get_content_type()
                 charset = part.get_content_charset()
-                payload = part.get_payload(decode=True)
+                cte = str(part.get('content-transfer-encoding', '')).lower()
                 if content_type not in ["text/plain", "text/html"]:
                     _logger.warning(f"Skipping {content_type}")
                     continue
-                if not payload:
+                if cte == "8bit":
+                    value = part.get_payload(decode=False)
+                else:
+                    payload = part.get_payload(decode=True)
+                    value = payload.decode(charset) if charset else payload
+                if not value:
                     continue
                 content_list.append({
                     "type": content_type,
-                    "value": payload.decode(charset)
+                    "value": value
                 })
         elif msg.get_content_type() in ["text/plain", "text/html"] and msg.get_payload(decode=True):
+            cte = str(msg.get('content-transfer-encoding', '')).lower()
+            charset = msg.get_content_charset()
+            if cte == "8bit":
+                value = msg.get_payload(decode=False)
+            else:
+                payload = msg.get_payload(decode=True)
+                value = payload.decode(charset) if charset else payload
+            _logger.info(f"Payload {msg._payload} charset {charset}")
             content_list.append({
                 "type": msg.get_content_type(),
-                "value": msg.get_payload(decode=True).decode()
+                "value": value
             })
 
         if not content_list:
diff --git a/worker/src/telegram_api/telegram.ts b/worker/src/telegram_api/telegram.ts
index 43b5e408..bddda120 100644
--- a/worker/src/telegram_api/telegram.ts
+++ b/worker/src/telegram_api/telegram.ts
@@ -61,11 +61,16 @@ export function newTelegramBot(c: Context, token: string): Telegraf {
             return await ctx.reply("无法获取用户信息");
         }
         try {
-            // @ts-ignore
-            const address = ctx?.message?.text.slice("/new".length).trim();
-            if (!address) {
-                return await ctx.reply("请输入邮箱地址");
+            if (c.env.RATE_LIMITER) {
+                const { success } = await c.env.RATE_LIMITER.limit(
+                    { key: `${CONSTANTS.TG_KV_PREFIX}:${userId}` }
+                )
+                if (!success) {
+                    return await ctx.reply("操作过于频繁");
+                }
             }
+            // @ts-ignore
+            const address = ctx?.message?.text.slice("/new".length).trim() || Math.random().toString(36).substring(2, 15);
             const [name, domain] = address.includes("@") ? address.split("@") : [address, null];
             const jwtList = await c.env.KV.get(`${CONSTANTS.TG_KV_PREFIX}:${userId}`, { type: 'json' }) || [];
             if (jwtList.length >= getIntValue(c.env.TG_MAX_ADDRESS, 5)) {