Timesite can use Amazon's email service to send emails on behalf of your own email address.
This is a slightly better alternative to using the Timesite email server as it is Amazons and has a marginally better reputation than the Timesite email server ;-).
To use Amazon to send all email from Timesite you should enter the email address you wish to send from in the Default From email address field as shown below. If your using accounting and invoicing then it is recommended you also enter an email to be used for emails sent regarding accounts such as invoices etc.
This screen can be found in Settings -> Email & Messaging
Once your email addresses have ben entered then in the Send email server tab click on: Use Amazon email Service.
As soon as you click this checkbox the screen will reload and hide all other options and a message box will appear as shown below. Amazon will send an email with a link in it - YOU MUST CLICK THIS LINK.
If you do not them Amazon will not send any email on your behalf which also means Timesite will be unable to send any emails.
Once you have clicked on the link in any emails sent to you by Amazon Timesite will send all emails to Amazon for delivery using the On Behalf of method.