[AusNOG] bigpond mail problems?

[Narelle]

Just to clarify - it's the mail relay that is causing our trouble. Our mail
server can't locate the telstra service used as a relay agent due to
blacklisting...


N

On Mon, Nov 7, 2016 at 4:33 PM, Narelle <narellec at gmail.com> wrote:

>
>
> We're experiencing this issue right now... and it is rather irritating.
> SInce 9:30am this morning and yes, we've logged a fault.
>
> and it seems to be because our smtp.telstrabusiness.com has been
> blacklisted by spamcannibal due to an incorrect reverse dns according to
> http://mxtoolbox.com/ blacklist checker...
>
>
> Narelle
>
> On Mon, Nov 7, 2016 at 4:26 PM, Karl Auer <kauer at biplane.com.au> wrote:
>
>> On Mon, 2016-11-07 at 15:48 +1100, James Gray wrote:
>> > Unable to relay mail via Telstra's SMTP servers. Postfix is claiming
>> > "Host or domain name not found. Name service error for
>> > name=smtp.telstra.com type=MX: Host not found, try again" but doing a
>> > manual session to "smtp.telstra.com" from a TID service works fine
>> > (both unencrypted TCP/25 and encrypted TCP/465).
>>
>> Why would you be looking up an MX record for smtp.telstra.com? Nobody
>> has addresses @smtp.telstra.com, do they?
>>
>> I get servfail when I manually look up an MX for smtp.telstra.com:
>>
>> kauer at kt:~$ dig  smtp.telstra.com mx
>> [...]
>> ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 47180
>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
>> [...]
>> ;; QUESTION SECTION:
>> ;smtp.telstra.com.              IN      MX
>> [...]
>>
>> Leaving that aside: Our client's Exchange server is doing the same as
>> your Postfix server; reporting a DNS failure when the host system has
>> no problem resolving the name that allegedly can't be resolved.
>>
>> And it is the servers themselves reporting the failure. They are not
>> reporting a rejection by a remote MTA, they are saying that they
>> themselves cannot resolve the relevant names.
>>
>> Puzzzledly, K.
>>
>> --
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Karl Auer (kauer at biplane.com.au)
>> http://www.biplane.com.au/kauer
>> http://twitter.com/kauer389
>>
>> GPG fingerprint: E00D 64ED 9C6A 8605 21E0 0ED0 EE64 2BEE CBCB C38B
>> Old fingerprint: 3C41 82BE A9E7 99A1 B931 5AE7 7638 0147 2C3C 2AC4
>>
>>
>>
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>>
>
>
>
> --
>
>
> Narelle
> narellec at gmail.com
>



-- 


Narelle
narellec at gmail.com
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