is there way that mails sent to group mail can automatically be deleted from 'sent ithems' folder?

In our dpt are 7 persons and we have group mail for mails that consider all persons from dpt and when I send mail to this group mail I receive mail I've send in 'inbox' and in 'sent ithems' folder. How can I create rule that this sent mail will only be in 'inbox 'so it is not doubled?

thanks