eMail: mail provider says: no autentication

[codefritz]

Although I've tried all encryption modes (ssl, tls) there is a problem with sending mails to some eMail Adresses.

 

For some eMail receivers addresses I get an error eMail with the following error-code:

 

"551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail."

 

 

I've tried using ssl and tls encryption - both doesn't work.

If I send the testmail for example to a google eMail account it works!?

 

Strange...?

 

Thanks...

[bellini13]

I guess I have to ask the obvious question, did you enter a username and password to your SMTP server?

[codefritz]

Sure I did.