Inbox advertising provides significant branding benefits.

Inbox advertising made 37.7% of people aware of one of the tested eHarmony campaigns.

Unaided brand awareness increased 11.5 percentage points.

Brand favorability increased 7.3 percentage points.

Brand awareness and favorability both improved when those researched were exposed to the campaign more than once.

The research examines the performance of both contextual and stand alone email ad units.