It appears that Florian Effenberger via mailop <flor...@effenberger.org> said:
>Hello,
>
>I have some issues with the Cyren blocklist - one recipient's server is
>bouncing mails back with
>
>550-5.7.1 This email was rejected because it violates our security policy
>550 5.7.1 CYREN IP reputation determined a medium risk associated with
>the sender address X.X.X.X. (in reply to DATA command)
>
>Their website lists the IP as yellow ("Suspicious"), with an explanation
>of "The IP has only recently started sending mails, and therefore still
>has an Unknown reputation".
I believe the recipient's mail system is misconfigured. If Cyren tags an IP
as yellow, they should soft fail with 450 so it can retry later.
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