I was wondering why it was necessary to leave the ?mkt_tok= URL parameter in the web page address bar after someone clicks a link in an email.
Links in emails are decorated with the track?=click&enid= URL parameters already, right? For example, here's the href for a link in an email:
http://go.example.com/track?type=click&enid=bWFpbGluZ2lkPWludGVybmV0Y3JlYXRpb25zQmV0YWN1c3QtLS0tMTc2Ni1wcm9kLTI2OCZtZXNzYWdlaWQ9MCZkYXRhYmFzZWlkPTI2OCZzZXJpYWw9MTI2NTI2OTY4MCZlbWFpbhlkPWFudGhvbnkucGljYUBpbnRlcm5ldGNyZWF0aW9ucy5jb20mdXNlcmlkPTEwMDQ4MDgmZXh0cmE9JiYm&&&http://www.example.com/?mkt_tok=3RkMMJWWfF9wsRow5%2FmYJoDpwmWGd5mht7VzDtPj1OY6hBapJLqJK1TtuMFUGpsqOOCQFQcCHZV1wx5dG%2FScc45TvOFYGFWeXTr7qaWHPt0eJewjhA%3D%3D
Then, this is what displays in the web page address bar:
http://www.example.com/?mkt_tok=3RkMMJWWfF9wsRow5%2FmYJoDpwmWGd5mht7VzDtPj1OY6hBapJLqJK1TtuMFUGpsqOOCQFQcCHZV1wx5dG%2FScc45TvOFYGFWeXTr7qaWHPt0eJewjhA%3D%3D
Does the decorated email link also cookie the user in addition to recording the link? If so, then why is it necessary to have ?mkt_tok= in the address bar afterwards?
Thanks!