Email sending of the SPOOL output

Dear guys,

when I try to send the output of the spool to an enterprise domain, I am gettign the below error message.

From the ECC systen where I am trying to mail to the domain, I could connect to out mail server with the port which I specified in the SCOT configuration.

Could you please suggest me where I went wrong.

No delivery to 'XXXatxxxxxxx.co.in', invalid recipient address

Message no. XS806

Diagnosis

The recipient address 'XXXatxxxxxxx.co.in' was invalid or initial.

System Response

The action was terminated.

Additional information of the node used (in the system language of the node):

501 5.1.8 Domain of sender address 'XXXatxxxxxxx'.

Procedure

Specify a valid recipient of the object. The address 'XXXatxxxxxxx.co.in' or address type '' you specified (no 'type' specification is equivalent to the SAP address) contains an error.

Thanks in advance.