大家好，请大家帮我看一下这个触发器错在哪里？

我想实现的是，当mail_send表中增加一条记录时将该记录插入mail_send_add
              当mail_send表中删除一条记录时将该记录插入mail_send_delete现在是mail_send_add可以实现，但mail_send_delete实现不了，大家帮我看看是什么原因啊？触发器代码如下
create or replace trigger tri_mail_send
  after insert or delete on mail_send
  for each row
begin
  if inserting then
  insert into mail_send_add (mail_id,mail_from_id,mail_to_id,mail_content,mail_send_time,read_flag,garbage_flag,download_url,mail_title,file_name,need_response) 
  values(:new.mail_id,:new.mail_from_id,:new.mail_to_id,:new.mail_content,:new.mail_send_time,:new.read_flag,:new.garbage_flag,:new.download_url,:new.mail_title,:new.file_name,:new.need_response);
  end if;
  if deleting then
  insert into mail_send_delete(mail_id,mail_from_id,mail_to_id,mail_content,mail_send_time,read_flag,garbage_flag,download_url,mail_title,file_name,need_response)
  values(:old.mail_id,:old.mail_from_id,:old.mail_to_id,:old.mail_content,:old.mail_send_time,:old.read_flag,:old.garbage_flag,:old.download_url,:old.mail_title,:old.file_name,:old.need_response);
  end if;
end tri_mail_send;