邮件发送服务器此时无法发送或接收邮件。请稍后再试。
The outgoing mail server cannot send or receive messages at this time. Try again later.
服务器推：如何告诉如果服务器的邮件已经发送到客户端？
Server push: how does server tell if message has already been sent to client?
连接到接收方邮件服务器，但发送邮件失败。
Connected to remote host, but failed after I sent the message.
连接到接收方邮件服务器，但发送邮件失败。
Connected to remote host, but failed after I sent the message.
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