公司机房迁移后，邮件的IP地址和反向解析都有所变动，迁移过来以后有大量的退信产生，查了一下域名的DNS，有如下警告，哪位大神帮忙看看怎么能够解决啊，多谢了

Some mailservers appear to be open relays. This should be fixed as soon as possible, as these mail servers are open to exploitation by third parties to deliver unauthorized email. Your mail servers should only relay mail for domains they are authoritative for.

Malformed greeting or no A records found matching banner text for following servers, and banner is not an address literal.RFC5321 requires one or the other (should not be a CNAME). If this is not set correctly, some mail platforms will reject or delay mail from you, and can cause hard to diagnose issues with deliverability. Mailserver details:
WARNING: The hostname in the SMTP greeting does not match the reverse DNS (PTR) record for your mail server. This probably won't cause any harm, but may be a technical violation ofRFC5321

One or more SOA fields are outside recommended ranges. Values that are out of specifications could cause delays in record updates or unnecessary network traffic. The SOA fields out of range are。

        有些邮件服务器似乎是开放中继。这应该是尽快修复，因为这些邮件服务器是开放的开发由第三方提供未经授权的电子邮件。你的邮件服务器应该只转发邮件的网域他们是权威。

       畸形的问候或没有发现以下服务器匹配的横幅文本的A记录和横幅是不是一个地址literal.RFC5321需要一个或另一个（不应该是一个CNAME）。如果设定不正确，有些邮件平台将拒绝或延迟邮件从你的，可能会导致很难与产能诊断问题。邮件服务器的详细信息：
警告：在SMTP问候的主机名不匹配您的邮件服务器的反向DNS（PTR）记录。这可能不会造成任何伤害，但可能是一个技术性违规ofRFC5321

        一个或多个SOA的字段以外推荐范围。值超出规格可能会导致记录更新或不必要的网络流量的延迟。在SOA领域超出范围是：