That was the problem. Changing it to
solved it. Silly me! And, be watchful when typing those email-ids ! :)
This is an automatically generated Delivery Status Notification
Delivery to the following recipient failed permanently:
Technical details of failure:
PERM_FAILURE: SMTP Error (state 10): 550 relaying denied for
I don't know whatz the reason. Anyone have an idea ? This happened when I sent out a GMail invite to a yahoo.co.in email-id (the 'abc' in the above is to protect the indentity of the recepient).