How are the email marketing metrics calculated? Follow

Last year we improved our metrics report to be automatically updated monthly. We also modified the way we calculate some of the stats from an aggregate model to a per send model. This is to remove any skew from significantly large senders. For example we have 10 customers, 9 of them send 10 emails with a 50% open rate, 1 of them sends 1 million with 1% open rate:

Aggregate would be:
number sent: 1000090 emails
number opened 10045
open rate: 1.01% (approx)

Per send rate would be:
overall open rate: 50 x 9, 1
average open rate: 45.1%

We also no longer breakdown the data by list size. Looking at data by list size becomes less important if you have an engaged opt in list.

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