Out of curiosity, did you have a control? That is, was it "Merry Christmas from BCC!" vs. "Happy Holidays from BCC!" vs. "[Normal email subject] from BCC!"? I'

Out of curiosity, did you have a control? That is, was it "Merry Christmas from BCC!" vs. "Happy Holidays from BCC!" vs. "[Normal email subject] from BCC!"? I'm curious to know how much "Merry Christmas" improves results vs. a baseline compared to how much "Happy Holidays" may hurt results, as has been suggested by others. The linked article only compares "Merry Christmas" vs. "Happy Holidays", which makes it hard to know if "Merry Christmas" is really helping, or if "Happy Holidays" is only hurting.