Kinda defeats the purpose of his customer paying him to do their IT work, does 
it not?


From: AusNOG <> on behalf of James Hodgkinson 
Sent: Wednesday, April 11, 2018 7:30:52 PM
To: Ross Wheeler;
Subject: Re: [AusNOG] ??

Tell the customer to call their supplier and tell them to make a complaint to 
THEIR supplier? Sounds like someone's cut-rate piece of junk service is causing 


On Wed, 11 Apr 2018, at 17:29, Ross Wheeler wrote:
> Gentlemen (and ladies!) - I'm not often stuck with no idea which way to
> even begin... but I am this afternoon.
> I've a customer who has been trying to email a supplier of theirs, but the
> mail keeps bouncing back. It's not the usual fat-fingered address. When I
> started investigating it, I see the recipients email is handled by mx1 and
> When I send an email (from a different domain to my customer) to the
> recipient I get an immediate bounce that says:
>       ----- Transcript of session follows -----
>    ... while talking to
>    >>> RCPT To:<****@******>
>    <<< 550 Sorry, we do not accept connections from you.
>    550 5.1.1 <****@******>... User unknown
>    451 4.4.1 reply: read error from
> I've checked and my mailservers are not in any blacklist I can find.
> I've never been used as a spam relay, or origin of spam, the mail server
> reputation on everything I've been able to find is "good". Yes, I have
> proper RDNS etc and have had for decades.
> Both and are a
> waste of time.
> whois doesn't return anything useful.
> Google isn't returning anything helpful or relevant.
> Anyone got any bright ideas?
> R.
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