It's best to use your SFI email as it never gets lost and appears in your SFI Message Manager. You can view all your 'Sent' SFI emails really easily by selecting 'Sent Messages' from the List box which has the default text 'Inbox' written in it from your SFI Message Manager. Also the Affiliates you have sent the message to will see an Alert message on their SFI Affiliate Centre page.