Archived from groups: microsoft.public.win2000.dns (
More info?)
If you have Trend IMSS with SPS with reverse lookup checking configured. It
inserts "RDNS Failed" into the header.
Cheers
Simon
---
"Roy Avery" <roymtbkr@nospam_rocketmail.com> wrote in message
news:OX4MLNF9EHA.824@TK2MSFTNGP11.phx.gbl...
> Thank you very much.
>
>
>
>
> "Ed Horley" <no-spamed-usergroups1@yahoo.com> wrote in message
> news:%23hdyl9E9EHA.3708@TK2MSFTNGP14.phx.gbl...
>> It looks like it was because the sender did not have a PTR record.
>>
>> Regardless, you should make sure you have your set up! It will help you
>> avoid issues long terms with sending and receiving e-mail from your MTA
>> in the future.
>>
>> Regards,
>> Ed Horley
>> Microsoft MVP Server-Networking
>>
>> "Roy Avery" <roy_avery@nospam_cmwlaw.net> wrote in message
>> news:OMUI$XE9EHA.1404@TK2MSFTNGP11.phx.gbl...
>>> Thanks Ed.
>>>
>>> I'll check out the presentation right away. I have a quick question
>>> though, did the RDNS fail against the sender's IP because the recipient
>>> did not have a PTR record, or because the sender did not have a PTR
>>> record?
>>>
>>> ---------example-------------
>>> Microsoft Mail Internet Headers Version 2.0
>>> Received: from sender_domain ([sender_IPaddress] RDNS failed) by
>>> recipient_email_servername with Microsoft SMTPSVC(5.0.2195.6713);
>>>
>>>
>>>
>>> "Ed Horley" <no-spamed-usergroups1@yahoo.com> wrote in message
>>> news:u1zbVTE9EHA.1404@TK2MSFTNGP11.phx.gbl...
>>>> It means that the mail server tried to do a reverse DNS lookup on the
>>>> IP address and there was no PTR record published. For mail servers it
>>>> is important that you publish a reverse entry that matches the forward
>>>> A record you have published in your zone. Please read RFC 2505 and
>>>> then RFC 2317.
>>>>
>>>> You can also review my PowerPoint slide deck at:
>>>>
http://www.sfntug.org/index.php?option=com_weblinks&task=view&Itemid=4&catid=87&id=22
>>>> if you want more details about what folks are doing as anti-spam
>>>> techniques.
>>>>
>>>> So, in a nutshell, publish a Pointer Record (PTR) in the reverse file
>>>> and you should be good to go.
>>>>
>>>> Regards,
>>>> Ed Horley
>>>> Microsoft MVP Server-Networking
>>>>
>>>>
>>>> "Roy Avery" <roy_avery@nospam_cmwlaw.net> wrote in message
>>>> news:e4Ki0NE9EHA.3708@TK2MSFTNGP14.phx.gbl...
>>>>> Why do our incoming email messages have a "RDNS failed" in the header?
>>>>> What can I do to fix this?
>>>>>
>>>>>
>>>>> ---------example-------------
>>>>> Microsoft Mail Internet Headers Version 2.0
>>>>> Received: from senderdomain ([senderIPaddress] RDNS failed) by
>>>>> emailservername with Microsoft SMTPSVC(5.0.2195.6713);
>>>>>
>>>>>
>>>>> Thank you.
>>>>>
>>>>> Roy Avery
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Remove "nospam_" from my email address to email me.
>>>>>
>>>>
>>>>
>>>
>>>
>>
>>
>
>