There’s a strange thing about subject lines in bulk mail and mess mailing — they have a “shelf life.” You can hit that perfect, high-open-rate magic once… and then watch it completely flop the second time you try it. It’s not just about people remembering your email — it’s about the way the human brain treats novelty. https://betaitso.blogspot.com/2025/08/subject-lines-that-work-onceand-only.html