Do you really need to? Basic statistics will tell you if the email campaign had any significant effect on site visits.
If I release a video and send an email newsletter at the same time, which one caused the traffic increase? Should I invest in making more videos of sending more emails?
alt Hacker News
If I release a video and send an email newsletter at the same time, which one caused the traffic increase? Should I invest in making more videos of sending more emails?