On my old SDR team we used to joke about what would be THE BEST performing subject line for opens. Doesn't have to get replies, just needs to be opened. Below are a few of my very favorite options we came up with. Note: we never used any of these.
"Your son bit me"
"You are OVERDUE"
"I know what you did..."
What would you use if you HAD to have your emails opened?
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