请帮忙看看啥意思?

isa2000

这是在http://www.dnsstuff.com测试的结果,其中MX测试中有一项错误,如下:
ERROR: The IP of one or more of your mail server(s) have no reverse DNS (PTR) entries/* (if you see "Timeout" below, it may mean that your DNS servers did not respond fast enough)*/. RFC1912 2.1 says you should have a reverse DNS for all your mail servers. It is strongly urged that you have them, as many mailservers will not accept mail from mailservers with no reverse DNS entry. You can double-check using the 'Reverse DNS Lookup' tool at the DNSstuff site if you recently changed your reverse DNS entry (it contacts your servers in real time; the reverse DNS lookups in the DNS report use our local caching DNS server). The problem MX records are:
153.120.104.202.in-addr.arpa [No reverse DNS entry (rcode: 3 ancount: 0) (check it)]

MAIL测试中有一个警告:
WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

mail.olym.com claims to be non-existent host mail.abc.com: <br /> 220 mail.abc.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at Thu, 13 Sep 2007 10:02:26 +0800 <br />
(olym为公网域名,abc.com为公司内部所用的域名.)

请各位帮忙看看是咋回事,谢谢.

redksy

没做反向域名解析
域名统一

jony

1.请你的ISP为你做反向解析
2.最好用统一的域名

isa2000

今天问了深圳电信,他们说做反向解析一个IP地址每个月要收200块,真TMD黑啊,
各位所在的电信要收费吗?

thm0908

完全免费的.

isa2000

没办法,深圳电信就是这样,200/月,一分都不少,
我也没去办理,先用着吧.