Thank you,
well, About your Questions,
When exactly does this message appears ?
Just when I try to send/reply an Email.
Could you login in the webmail ?
Yes, I can.
Could you see the content of your mailbox ?
Yes, Iam able to, and I think everything is working perfectly, except, the main features (send and receive Emails)
Could you write an email and send it ?
No, I cannot.
Thank you for your usefull infomations, and My domain name is F-kar.com (server SK)
One again, I do Thank you for your replies.