Open Rate Subject Line AB Test

[kristenstangelo]

We have a subject line AB test going right now that is testing a champion subject line against two challenging subject lines. Marketo is stating that the open rates for all of the subject lines are above 50%. However when I manually divide the amount of opens by the amount of delivered emails for each subject line I get very different open rates (below 25%). Does anyone know exactly how Marketo is calculating open rate or "proportion of opens (%)"?

[Jasbir_Kaur]

// Removed //

[SanfordWhiteman]

I get the sense that this response was AI-generated because it’s written with confidence yet contains clear inaccuracies.

For example, Marketo’s algorithm for determining Opens in built-in reports does not solely rely on the tracking pixel being downloaded.

Please consider whether you wish to (a) stand by this reply and task others (who are volunteers) with correcting it or (b) delete it yourself.