email problem -- SMTP Error: The following recipients failed:

hi

i have a problem with my mail i hope there is anyone can help me please

i test out the check out in the end of part the system send out the email but there is

a error message on the page is below:

Email Error: SMTP Error: The following recipients failed:

i have check out my webmail with the host company it is find to send and receive

mail.

please help

:yes::yes::yes:

admin---con---mail---all emails must be sent via current domain----no

I solved this problem by setting as above ,use smtpauth with godaddy email account.

I 've put email must be sent from known domain
but I didn't work.
Still the same error : Email Error: SMTP Error: The following recipients failed: