A cover with the half dressed girl appeals to A, but a half naked boxer with a gun appeals to B.
Same book inside.
You can do the same with email messages: If you have a good message, send one with subject line A; wait a few days, and send all those who did NOT open the first email, the same message inside. But this time, with a DIFFERENT subject line.
You can do this RIGHT NOW.
That’s just one of about a dozen clever email tips two extremely, no – wildly successful marketers offer. I just got them, totally fun and helpful. Not $1997 or $497. Under $99 even. HERE.