Blat not authenticating email user

Hi,

I configured Blat to enable email notification on Netbackup, it is working fine however if I specify a username and password in the registry, I am getting the following errors:

*** Warning ***  The SMTP server did not accept Auth PLAIN value.
*** Warning ***  Are your login userid and password correct?
*** Warning ***  The SMTP server did not accept Auth LOGIN PASSWD value.

Any idea ?