What’s the difference between A/B testing content vs domain reputation?

Content A/B testing varies the message while holding sender identity constant. It measures how different subject lines, body content, or creative affects placement.

Domain reputation testing varies the sending domain while holding content constant. It measures how different reputation levels affect placement of identical content.

Content testing answers: "Which message performs better?"

Domain testing answers: "How much does my reputation help or hurt?"

Both are valuable. Combined, they reveal whether problems stem from what you send or who you are.

Test your cargo separately from your ship's reputation.