Error while sending email.

SOLVED

Hi All,

While sending emails by users other than system administrator (the email id used for office 365)an error appears. Upon checking the log the following error is encountered. 

"SMTP: Could not send message. This may be due to AUTH not being supported by the MTA, no supported authentication methods being available, or an incorrect username / password."

The client' s IT team has configured office so that all CRM users can send on behalf of the account. Still any other user can't send emails.

 Any help?