[CentOS] help from community

Thu Apr 12 12:01:35 UTC 2012
Prabhpal S. Mavi <prabhpal at digital-infotech.net>

Dear Peter,

Thanks for your swift response, well diagnosed.

my_server=mail.digital-infotech.net (sending)
destination=mx4.servershost.net (receiving)

I feel that part of log
[host mail.digital-infotech.net[] said: 450 4.7.1 Client host
rejected:cannot find your hostname, []

is logged by my server, perhaps it is receiving bounce back. because if my
server is sending mail, it don't have to perform any look up expect MX.

The DNS record problem is with receiver server not sender. why receiver
said [Sender address rejected: unverified address]. this is what i have
problem with. Kindly advice ....

Thanks / Regards

> Hi,
> On Thu, Apr 12, 2012 at 2:29 PM, Prabhpal S. Mavi
> <prabhpal at digital-infotech.net> wrote:
>> it is something out of control, because it is not my problem. Our server
>> has all record created (A,MX,PTR,SPF etc). i have three relay hosts
>> fully
>> functional. destination server is not accepting from any relay host.
> Looking at the error msg briefly I think the problem is with the DNS
> records:
>> rejected: cannot find your hostname, [] (in reply to RCPT
>> TO command) (in reply to RCPT TO command))
> $ host
> domain name pointer mx4.servershost.net.
> $ host mx4.servershost.net
> mx4.servershost.net has address
> As you can see the DNS resolves to different IP address than given by
> the PTR record. Some email systems consider this as an indication of a
> misconfigured mail server (spam sending attempt) and refuse to relay.
> Best,
> Peter
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Thanks / Regards
Prabhpal S. Mavi