You want to save receipts that you send into that folder regardless of what client you use. This is a good idea even if you weren't using SaneBox because Sent receipts are definitely something that you want to have a historic copy of and access to from all your devices. But your Sent folder setup is crucial for us to be able to: A) put replies to your emails in the Inbox and B) create your SaneReminders.
Here is a look at how to do this in the following email clients:
- Apple Mail
- Outlook Exchange
- Outlook 2013
- Outlook 2011 Mac
- Outlook 2010
- Outlook 2007
- Outlook 2003 (No longer supported by Microsoft)
- Windows Live
- Mail.app (MacMail)
In Postbox, in Preferences or Options / Accounts / YourAccount / Copies & Folders, make sure that "Place a copy in…" is checked
We're not sure how to do this with Sparrow. If you figure it out please drop us a note so we can add it to our help pages.