>> Thanks. So my understanding is correct that Postfix gets the hostnames you
> see in the logs from PTR records?
>
> Yes.
>
>> You are saying that additionally, if the A record for the domain
> doesn't match the client IP, the PTR will be ignored and thus you'll
> still get "unknown"?
>
E.B. wrote:
> Thanks. So my understanding is correct that Postfix gets the hostnames you
> see in the logs from PTR records?
Yes.
> And that "connect from unknown[1.2.3.4]" is caused by a missing PTR (or DNS
> issue)?
A missing PTR is one cause. A DNS glitch that means the PTR lookup
fails is
>>> Hello,
>>>
>>> My understanding was clients for whom you see this in the logs:
>>>
>>> connect from unknown[1.2.3.4]
>>>
>>> Do not have a PTR/rDNS set up for themselves.
>>
>> For Postfix to include the rDNS in the log and Received: header, the PTR
>> name must then resolve back
> On Monday, November 18, 2013 7:57 AM, Kris Deugau wrote:
> > E.B. wrote:
>
>> Hello,
>>
>> My understanding was clients for whom you see this in the logs:
>>
>> connect from unknown[1.2.3.4]
>>
>> Do not have a PTR/rDNS set up for themselves.
>
> For Postfix to include the rDNS in
E.B. wrote:
> Hello,
>
> My understanding was clients for whom you see this in the logs:
>
> connect from unknown[1.2.3.4]
>
> Do not have a PTR/rDNS set up for themselves.
For Postfix to include the rDNS in the log and Received: header, the PTR
name must then resolve back to that same IP as we
On Mon, Nov 18, 2013 at 03:43:17AM -0800, E.B. wrote:
> I did "dig -x 1.2.3.4" on the server for the same IP address and the result
> came back with the correct domain name. So why didn't postfix see the host
> name? I restarted postfix in case it was caching, but it didn't help.
Show proof. Es
Am 18.11.2013 12:43, schrieb E.B.:
> My understanding was clients for whom you see this in the logs:
>
> connect from unknown[1.2.3.4]
>
> Do not have a PTR/rDNS set up for themselves. However, I recently tested a
> connection (using telnet on the client side, connecting to port 25) from a
>
Hello,
My understanding was clients for whom you see this in the logs:
connect from unknown[1.2.3.4]
Do not have a PTR/rDNS set up for themselves. However, I recently tested a
connection (using telnet on the client side, connecting to port 25) from a
server that does have rDNS in place, but I
