RE: Mail Bounce back 550 no RDNS entry for xxx.xxx.xxx.xxx

Discussion in 'Windows Small Business Server' started by Krystian Zieja, Jul 9, 2009.

  1. The reason for this is that your do not have reverse entry for your mail
    server:

    you can check if it exists using nslookup:

    C:\>nslookup

    > server yourISPDNSServerIP


    > yourMailServerIP


    It should print you name and ip address

    alternativelly you can use <a href="mxtoolbox.com">mxtoolbox.com</a>

    With kind regards
    Krystian Zieja
    "Ritesh Bhange" wrote:

    > Hello,
    >
    > I have mail bounce problem, My mail are bounce from one specific
    > domain it show 550 no RDNS entry for xxx.xxx.xxx.xxx.
    >
    > This ip is my firewall outbound ip its not mail server domain ip.
    >
    > How to resolve this issue.
    >
    > I hoping lot form all of you.
    >
    > Thanks
    >
     
    Krystian Zieja, Jul 9, 2009
    #1
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  2. Krystian Zieja

    David Barnes Guest

    Sounds like your SBS server is set to "deliver direct to internet" and not
    to use the mail relay server at your ISP.
    If this is the case, then you probably don't have a "proper" business
    internet connection.
    Talk to your ISP..

    to be a "Proper" internet connection and to be able to freely send mail you
    need the following.
    1/ fixed IP address, statically assigned to you and NOT a locked 'dynamic'
    address (like Virgin use in the UK)
    2/ Your IP address is NOT listed as dynamic in the main DUHL lists [see
    http://www.us.sorbs.net/faq/dul.shtml] There are other lists you should
    check.
    3/ You MUST have a 'reverse' PTR DNS address set for your IP Address [see
    'reverse DNS lookup' on http://www.dnsstuff.com/tools]
    -- This is the bit that is [currently] causing your mail to bounce..
    Only your ISP can fix the above 3...

    The following are also very important if not critical as well....
    4/ you should have a forward DNS name for the IP address you are using....
    so if you use 178.67.44.3 you 'should' have name1.mydomain.net (or such
    like) A record with that IP address.
    5/ in some cases your PTR record should match the forward A record.
    6/ Most importantly... setup the SPF record TXT entry in the DNS for the
    domain name you are using for e-mail. see http://old.openspf.org/wizard.html


    David Barnes



    "Krystian Zieja" <> wrote in message
    news:...
    > The reason for this is that your do not have reverse entry for your mail
    > server:
    >
    > you can check if it exists using nslookup:
    >
    > C:\>nslookup
    >
    >> server yourISPDNSServerIP

    >
    >> yourMailServerIP

    >
    > It should print you name and ip address
    >
    > alternativelly you can use <a href="mxtoolbox.com">mxtoolbox.com</a>
    >
    > With kind regards
    > Krystian Zieja
    > "Ritesh Bhange" wrote:
    >
    >> Hello,
    >>
    >> I have mail bounce problem, My mail are bounce from one specific
    >> domain it show 550 no RDNS entry for xxx.xxx.xxx.xxx.
    >>
    >> This ip is my firewall outbound ip its not mail server domain ip.
    >>
    >> How to resolve this issue.
    >>
    >> I hoping lot form all of you.
    >>
    >> Thanks
    >>
     
    David Barnes, Jul 9, 2009
    #2
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