我收到很多邮件反弹邮件。 反弹的消息说：
如果没有DNS PTRlogging，我们不能接受来自IP 213.42.234.186的电子邮件。 联系您的ISP / HSP为您的服务器设置PTRlogging。
我已经validation了我们的邮件服务器（mail.royalgroup.ae）被列为所讨论的IP的PTRlogging。 我不明白的是为什么我们的防火墙的IP地址（.186）列在退回消息中。
我已经包含了下面的标题整个反弹的消息。
-------------------------------------------------------------------------- MDaemon Delivery Status Notification - http://www.altn.com/dsn/ -------------------------------------------------------------------------- The attached message had PERMANENT fatal delivery errors. After one or more unsuccessful delivery attempts the attached message has been removed from the MDaemon mail queue on this server. The number and frequency of delivery attempts are determined by local configuration. -------------------------------------------------------------------------- YOUR MESSAGE WAS NOT DELIVERED TO ONE OR MORE RECIPIENTS -------------------------------------------------------------------------- Failed address: [email protected] --- Session Transcript --- Tue 2013-04-23 08:27:00: Parsing message <xxxxxxxxxxxxxxxxxxxxxxxx\pd35000094660.msg> Tue 2013-04-23 08:27:00: * From: [email protected] Tue 2013-04-23 08:27:00: * To: [email protected] Tue 2013-04-23 08:27:00: * Subject: a Tue 2013-04-23 08:27:00: * Size (bytes): 32512 Tue 2013-04-23 08:27:00: * Message-ID: <002d01ce3fdb$53e0eb40$fba2c1c0$@ae> Tue 2013-04-23 08:27:00: Attempting SMTP connection to [mail.ru] Tue 2013-04-23 08:27:00: Resolving MX records for [mail.ru] (DNS Server: 213.42.20.20)... Tue 2013-04-23 08:27:00: * P=010 S=000 D=mail.ru TTL=(8) MX=[mxs.mail.ru] {94.100.176.20} Tue 2013-04-23 08:27:00: Attempting SMTP connection to [94.100.176.20:25] Tue 2013-04-23 08:27:00: Waiting for socket connection... Tue 2013-04-23 08:27:00: * Connection established (127.0.0.1:3187 -> 94.100.176.20:25) Tue 2013-04-23 08:27:00: Waiting for protocol to start... Tue 2013-04-23 08:27:01: <-- 220 Mail.Ru ESMTP Tue 2013-04-23 08:27:01: --> EHLO mail.royalgroup.ae Tue 2013-04-23 08:27:01: <-- 250-mx142.mail.ru ready to serve Tue 2013-04-23 08:27:01: <-- 250-SIZE 73400320 Tue 2013-04-23 08:27:01: <-- 250 8BITMIME Tue 2013-04-23 08:27:01: --> MAIL From:<[email protected]> SIZE=32512 Tue 2013-04-23 08:27:02: <-- 250 OK Tue 2013-04-23 08:27:02: --> RCPT To:<[email protected]> Tue 2013-04-23 08:27:02: <-- 250 OK Tue 2013-04-23 08:27:02: --> DATA Tue 2013-04-23 08:27:03: <-- 354 Go ahead Tue 2013-04-23 08:27:03: Sending <xxxxxxxxxxxxxxxxxxxxxxxx\pd35000094660.msg> to [94.100.176.20] Tue 2013-04-23 08:27:03: Transfer Complete Tue 2013-04-23 08:27:05: <-- 550 We cannot accept email from IP 213.42.234.186 without a DNS PTR record. Contact your ISP/HSP to set up a PTR record for your server. Tue 2013-04-23 08:27:05: --> QUIT --- End Transcript --- 您的防火墙很可能是用于过滤垃圾邮件和病毒的透明SMTP代理。 为防火墙的外部IP添加PTRlogging。 当你在这里，确保你正在更新你的SPFlogging（如果有的话）。
您需要请求您的数据中心或ISP为您的邮件服务器IP添加PTRloggingwghich是213.42.234.186
所以当有人做nslookup 213.42.234.186它应该得到解决您的邮件服务器主机名。
我已经validation了我们的邮件服务器（mail.royalgroup.ae）被列为所讨论的IP的PTRlogging
不是从这里不是…
** server can't find 186.234.42.213.in-addr.arpa.: NXDOMAIN
而且您没有configurationSPF。
我不明白的是为什么我们的防火墙的IP地址（.186）被列在退回消息中。
您是否检查过路由器另一端的数据包上的IP地址？ 最有可能的是它被configuration为伪装。