Mailchimp says 18-22% is average but I'd love to hear what people have experienced as good and standard email open and click-through rates for both a) marketing blasts emails b) transactional emails - more personalized and don't go to everyone at once.
I can share my numbers in Mailchimp.
Average
Opens: 26.4%
Clicks: 5.3%
Highest:
Opens: 37.3%
Clicks: 12.4%
Lowest:
Opens: 9.6%
Clicks: 0.8%