I'm using EXM 3.5 and when I click on Unsubscribe link (/sitecore modules/Web/EXM/Unsubscribe.aspx)
I got an error:
ERROR Attempt to access MessageEventPage with unverified url: /sitecore modules/Web/EXM/Unsubscribe.aspx
INFO Cannot handle unsubscription event. No message id was provided in the request
6024 10:41:28 ERROR Failed to process an email opened task
Any ideas?