我知道，这个 smtp 状态已经有答案了，但抱歉：我不明白。我的一个客户发送了大量邮件，有些无法发送，原因是：
This is the mail system at host mailserver.blabla.local.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<[email protected]>: host mail.hostingserver.de[ip] said: 354 End data
with <CR><LF>.<CR><LF> (in reply to end of DATA command)
更多信息：
Final-Recipient: acc1; [email protected]
Original-Recipient: acc1;[email protected]
Action: failed
Status: 5.5.0
Remote-MTA: dns; mail.hostingserver.de
Diagnostic-Code: smtp; 354 End data with <CR><LF>.<CR><LF>
Return-Path: <[email protected]>
Received: from localhost (localhost [127.0.0.1])
by neptun.migra-mv.local (Postfix) with ESMTP id 071A07418E6;
Thu, 3 Nov 2016 12:04:22 +0100 (CET)
X-Virus-Scanned: by amavisd-new-2.10.1 (20141025) (Debian) at migra-mv.local
Received: from mailserver.blabla.local ([127.0.0.1])
by localhost (mailserver.blabla.local [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id ZkXsQejEkDHg; Thu, 3 Nov 2016 12:04:10 +0100 (CET)
Received: from [192.168.2.196] (unknown [192.168.2.1])
by mailserver.blabla.local (Postfix) with ESMTPSA id 512A8741B70;
Thu, 3 Nov 2016 12:03:31 +0100 (CET)
To: Migra MV <[email protected]>
From: IntegrationsFachDienst Migration MM <[email protected]>
Subject: =?UTF-8?Q?Aktuell:_=c3=9cber_200_Bildungsma=c3=9fnahmen_auch_f?=
=?UTF-8?Q?=c3=bcr_Zugewanderte_in_ganz_M-V?=
Message-ID: <[email protected]>
Date: Thu, 3 Nov 2016 12:03:51 +0100
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101
Thunderbird/45.2.0
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="------------55D5725BF82BAD7B1782022E"
为什么我们会收到此错误并且邮件没有发送？事实上，大多数邮件都发送成功。这可能是收件人的错误吗？
答案1
可能和这个答案。客户端或服务器未正确遵循协议。