How do you control fornoise when open/click data isn"t directly observable?

We dont try to infer exact opens/clicks. The system focuses on relative, repeatable patterns across many emails, which tends to wash out single-campaign noise.

Looks useful, tracks subject lines?

Yep! Tracks subject lines + performance patterns. See example: https://app.newsletrix.com/share/n/309f1f02-cf51-4528-addc-d...