Mail problem-Relaying denied.Proper authentication required.Error Number 0x800CCC79
First, I hope that I am in right forum I write this problem.
Problem is with mail - I can't to send email via my hosting accounts. I have my ded. server which is located at ThePlanet and in it I have my sites. I try to send email messages via POP3 but with each email account (which are for different domains) I get this error into Outlook Express:
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'email@example.com'. Subject 'Re: ', Account: 'mail.mysite.com', Server: 'mail.mysite.com', Protocol: SMTP, Server Response: '550 5.7.1 <firstname.lastname@example.org>... Relaying denied. Proper authentication required.', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
When I enter my mail from which I send email I get that email (only that emails want to send). I try all combinations into O.E. (turn ON My server require autentification I all time need to enter user login to send mail, and tur OFF dont work, get this errors).
Please, what can be problem?
In s. is Red Hat linux and Ensim panel.
Thank you, Mladen