Hello there,
Is there anyone ho can tell me why "Grey listing" is not working as i would?
1/ One client setup grey listing and is working fine (temporary rejected in firewall and Server(mail) will retry next time......after a couple of minutes it will arrive!
2/ Second client grey listing will log in firewall the same as above (temporary rejected by firewall, retry later....) it will reject the mail completly "BACK"to sender with error mailserver.domain.com #5.5.0 smtp;550 all relevant MX records point to non-existent hosts>[:S]
All these client are working with Exchange server behind the Astaro Firewall's(V6.303).
I'll hope anyone could give me some hints to resolve this problem, the delay is not the problem. The Reject of the send mail is!
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