diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index c4748c9..d5b9b94 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -764,6 +764,48 @@ class Session():
             except:
                 return self.respond(ResponseCode.NNTP_POST_FAILED)
 
+    def _cmd_ihave(self, message_id):
+        sql = """
+            select
+                count(message_id)
+            from
+                message
+            where
+                message_id = ?
+        """
+
+        cr  = self.db.execute(sql, (message_id,))
+        row = cr.fetchone()
+
+        if row is not None and row[0] > 0:
+            return self.respond(ResponseCode.NNTP_ARTICLE_NOT_WANTED_ID)
+
+        self.respond(ResponseCode.NNTP_INQUIRY_ARTICLE_ID)
+
+        message = Message()
+
+        while True:
+            line = self.readline()
+
+            if line == '':
+                self.active = False
+                break
+            elif line == '.':
+                if message.message_id != message_id:
+                    return self.respond(ResponseCode.NNTP_POST_FAILED)
+
+                if self._save_message(message):
+                    return self.respond(ResponseCode.NNTP_ARTICLE_RECEIVED_ID)
+                else:
+                    return self.respond(ResponseCode.NNTP_POST_FAILED)
+            elif line == '..':
+                line = '.'
+
+            try:
+                message.readline(line)
+            except:
+                return self.respond(ResponseCode.NNTP_POST_FAILED)
+
     def _cmd_date(self):
         timestamp = datetime.datetime.now(datetime.UTC)
 
@@ -795,6 +837,7 @@ class Session():
         'XOVER':        _cmd_over,
         'STAT':         _cmd_stat,
         'POST':         _cmd_post,
+        'IHAVE':        _cmd_ihave,
         'DATE':         _cmd_date,
         'QUIT':         _cmd_quit,
     }