Why does optimisation not work when using multiple subject lines?

Last Updated: 28/11/2024     Tags: subject, lines, optimisation, multiple, optimization
  • Switch Version
  • V5
  • V4

The most likely issue is that you have checked the Link with subject line with optimization groups box. This means that you would like to lock a particular content version with a particular subject lines. In order to try all combinations of content and subject line, this box must be unchecked.