Can I use Email Analytics with my Constant Contact templates?
Email Analytics will work on Constant Contact if you are using a custom template. It looks like Constant Contact does not allow editing of their Basic editor templates, so if you are using this you will not be able to use the Email Analytics code. Email Analytics codes can only be used if you are using a custom template/advanced editor within the 'Use my Own Code' area. These screenshots show where this can be found:
This article on Constant Contact's resources is helpful for getting started with using custom templates.