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我正在使用MDaemon作为外部邮件服务器，最后几天我收到一封错误消息“554消息不符合标准”。任何想法可能导致它？其他机器工作正常。SMTP错误554
更多信息....这是日志文件：
Mon 2008-10-20 16:11:37: Session 7831; child 1; thread 3908 Mon 2008-10-20 16:11:36: Accepting SMTP connection from [80.78.72.135 : 43579] Mon 2008-10-20 16:11:36: Performing PTR lookup (135.72.78.80.IN-ADDR.ARPA) Mon 2008-10-20 16:11:36: * Error: Name server reports domain name unknown Mon 2008-10-20 16:11:36: * No PTR records found Mon 2008-10-20 16:11:36: ---- End PTR results Mon 2008-10-20 16:11:36: --> 220 ikubinfo.com ESMTP MDaemon 9.5.2; Mon, 20 Oct 2008 16:11:36 +0200 Mon 2008-10-20 16:11:36: 250 ikubinfo.com Hello RS, pleased to meet you Mon 2008-10-20 16:11:36: Mon 2008-10-20 16:11:36: Performing IP lookup (ikubINFO.com) Mon 2008-10-20 16:11:36: * D=ikubINFO.com TTL=(633) A=[216.75.60.232] Mon 2008-10-20 16:11:36: * P=010 S=000 D=ikubINFO.com TTL=(708) MX=[mail.ikubinfo.com] Mon 2008-10-20 16:11:36: * D=ikubINFO.com TTL=(633) A=[216.75.60.232] Mon 2008-10-20 16:11:36: ---- End IP lookup results Mon 2008-10-20 16:11:36: Performing SPF lookup (ikubINFO.com/80.78.72.135) Mon 2008-10-20 16:11:36: * ikubINFO.com 80.78.72.135; matched to SPF cache Mon 2008-10-20 16:11:36: * Result: pass Mon 2008-10-20 16:11:36: ---- End SPF results Mon 2008-10-20 16:11:36: --> 250 , Sender ok Mon 2008-10-20 16:11:36: Mon 2008-10-20 16:11:36: Performing DNS-BL lookup (80.78.72.135 - connecting IP) Mon 2008-10-20 16:11:36: * sbl-xbl.spamhaus.org - passed Mon 2008-10-20 16:11:36: * relays.ordb.org - failed Mon 2008-10-20 16:11:36: * bl.spamcop.net - passed Mon 2008-10-20 16:11:36: ---- End DNS-BL results Mon 2008-10-20 16:11:36: --> 250 , Recipient ok Mon 2008-10-20 16:11:37: 354 Enter mail, end with . Mon 2008-10-20 16:11:37: Message size: 389 bytes Mon 2008-10-20 16:11:37: --> 554 Message does not conform to standards Mon 2008-10-20 16:11:37: 221 See ya in cyberspace Mon 2008-10-20 16:11:37: SMTP session terminated (Bytes in/out: 491/319)
需要更多信息：如果可能的话，SMTP会话的抄本（直到DATA行），电子邮件客户端发送电子邮件的内容，MDaemon日志中提到的内容等。 – tzot 2008-10-21 13:02:27