Unable to send mails to gmail or yahoo from SWBP

Hi ,

I was unable to send mails to gmail or yahoo (other than outlook) through SWBP .

Sucessfully sending mails to outlook . When iam trying to send mails to gmail getting error as follows :

Date Time Status

02/15/2012 15:09:26 Document sent

15:09:26 Waiting for Send Process

15:10:12 No delivery to XXXXXXX@gmail com, authentication required .

When iam trying with workflow iam getting the error as follows:

02/16/2012 15:11:13 0777 UPDATE_SOSC G No delivery to XXXXXX@gmail com, invalid recipient address

Regards

RAGHAVENDAR M