Unable to send mail. SASL DIGEST-MD5 authentication failed

[G.Cambianica]

Plesk 11.0.9

Unable to Send mail from client, authentication error:

SASL DIGEST-MD5 authentication failed: authentication failure

Receiving mail without problem

 

[G.Cambianica]

I tried now with other mail client then Outlook 2007/2010 and work fine!
Autentication error only with Outlook 2007/2010.