Your server IP is probably banned at spamhaus or you're using dynamic IP.
No. Kloxo-MR does not use SMTP authentication.
Important: If you are using any normal email software (such as Outlook, Entourage, Thunderbird, Apple Mail, etc.) and you are being blocked by this Spamhaus PBL listing when you try to send email, the reason is simply that you need to turn on "
SMTP Authentication" in your email program settings. For help with SMTP Authentication or ways to quickly fix this problem click here.
Before the upgrade was OK.
On the server in Afterlogic also does not work. I need to clear the SMTP Authentication to send.
Using the e-mail I send gmail.com or by using g.pl.