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. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop