[AusNOG] bigpond mail problems?

[Narelle]

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
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