https://blog.fastdot.com/wordpress/how-to-measure-wordpress-email-marketing-campaign-success/?seraph_accel_prep=eyJub25jZSI6IjlmMDI2YmEwMDQ5ZDRmNzk0MDIyMzlhMmMxYTI5NjMxIiwiX3RtIjoiMTcxNjE1MzMzNi4yMjMxIiwicGMiOiJQOGpFYXgiLCJscm4iOiJcL3NcL21cL3ZcL2NtblwvbFwvQFwvZDllMzBjYTU3ZGY3MmI5MWE5MDcwNTg3YmNjMjcyY2MuZGF0Lmd6In0=