Send & Archive
Sparrow 1.3 brings you a precious tool to reach inbox zero: Send & Archive.
Just tick the ‘Enable Send & Archive’ in Sparrow Advanced Preferences and you’re done.
Once activated, the Send & Archive will respond to usual Send shortcuts in Sparrow. Pressing ⇧-⌘-D and ⌘-Enter will make the message you’re responding to and your reply disappear from your inbox in a glimpse.