SMTP ERROR: DATA END command failed: 553 Relaying disallowed as Admin 2

SMTP ERROR: DATA END command failed: 553 Relaying disallowed as Admin 2

I get following error when Breezing form tries to send mail from my contact us section 

SMTP ERROR: DATA END command failed: 553 Relaying disallowed as Admin 

We joomla installation can send mail properly from my site using sMTP but has issue in sending mail from breezing forms. I have made the same settings in breezing forms that I have in joomla

Regards
Sandeep