Commercial clients average deliverable email append results:
- Household appending: 16%
- Individual appending: 12%
Nonprofits average deliverable email append results:
- Household appending: 15%
- Individual appending: 9%
Average deliverable email change of address results:
- Email Change of Address: 8% (both commercial and nonprofits)
FreshAddress also noted that quarterly processing of the list more than doubled the success rate over the course of a year for both email appending and email change of address.
eINFO - a collection of articles and studies about email marketing.