Cei de la MarketingSherpa  impreuna cu mediul academic au reusit sa dezvolte o formula care evalueaza eficienta unei camapanii de email marketing. Formula magica arata cam asa:
ECE = 3lq + 2or + 2bc + 2it + ef + dr

Unde:
ECE = Email Campaign Effectiveness
lq = List Quality
or = Offer Relevance
bc = Body Copy
it = Intrinsic Timing [...]