> We are seeing problems with greylisting in mails coming from UPC
> mailservers. After receiving our "451 Greylisting" response, we never
> see a retry of the mail again. The sender does not receive an NDR. We
> have seen this behaviour from the servers at 84.116.36.xxx. Other
> servers for example the ones in the range 62.179.121.xxx are retrying
> correctly.
> Anybody from UPC here to help sort this out or is anyone else seeing the
> same problem or is no one using greylisting anymore these days?

We have seen the very same problem with the very same ISP...

We turned off greylisting for now.

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