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550 inconsistent or no DNS PTR record for RRS feed

  • 問題

  • I've found a problem for sending an email to other. It comes out the following error message:

    email.abc.com #5.5.0 smtp;550-Inconsistent or no rDNS record for 123.123.123.58 (see RFC1912 2.1)

    I had checked with some rDNS website of 123.123.123.58. It do have rDNS of this IP.

    Can anyone of you help me to solve this problem?

    Thank you very much.

     

     

    2010年8月30日 上午 09:53

解答

  • Hi Jason,

     

    As you described, you mean only some part of clients can’t receive email from your exchange, not all, right? Then I believe the exchange server works well, DNS is point.

    Please make sure the client can reserve IP address of you exchange server, this action might involve ISP.

    2010年8月31日 上午 06:52
    版主

所有回覆

  • Dear Jason,

    Did you use nslookup 123.123.123.58 to reserve the domain ?

    firstly, you should confirm that you can connect to the 123.123.123.58, then you can try to telnet the port 25 of the remote server. 

    If failed, the third party anti-virus of firewall might caught the problem.

     

    2010年8月31日 上午 01:59
    版主
  • Hi epsilon_111508,

     

    Thank you for your help.

    I had confirm I can connect 123.123.123.58 by using telnet. "mail from" and "rcpt to" are success too.

    I had tried send a email to my gmail account, then I view the source code of this testing email. The sender can show 123.123.123.58. But I just wondering the client who cannot receive our email is the rDNS show 123.123.123.61.

    We are using Echange 2003 Std ver. one Front End and one Back End server. Both of these two servers are behind ISA server. And we had few fix IP too. 123.123.123. 57 ~ 62.

    Hope this information can let anyone of you can understand more about my question.

    Sorry for my poor presentation.

     

    2010年8月31日 上午 04:25
  • Hi Jason,

     

    As you described, you mean only some part of clients can’t receive email from your exchange, not all, right? Then I believe the exchange server works well, DNS is point.

    Please make sure the client can reserve IP address of you exchange server, this action might involve ISP.

    2010年8月31日 上午 06:52
    版主
  • Hi Leo,

    I had solve this problem by calling our ISP to update the rDNS record. Thank you for you help again and sorry for my late reply.

     

    Jason

     

    2010年10月4日 上午 11:19
  • In fact that your issues is realted to your DNS MX records IP is not equal to your mail send out to internet IP address. Some of the Mail gateway/system would configured policy to lookup the domain IP is it the same with your mail.
    2010年10月10日 下午 03:00