Quick update on that case.
UPC Switzerland is fully aware of the problem.
The Mail-Platform in the Netherlands is operated by UPC Austria
(probably chello.at). And they still deny that there is a problem
on their side and blame the ISPs that do greylisting.
UPC Switzerland is trying to escalate
Hi Per
> Is there any point in greylisting genuine mailservers? We only
> greylist dodgy-looking setups.
True, no point in greylisting a propper SMTP engine that does queueing
and would resend the email later in case of a 4XX error.
But how do you find out which ip's to greylist and which not
Hi
> I do not greylist servers with correct spf record. With UPC i think
> the main problem is the missing NDR.
We also do not greylist if the SPF record matches.
We do not greylist IP's listed in the DNSWL.org or SWINOG
Whitelist either.
But none of this was true for the new 'NL' ranges used
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