It would be possible, to define for each product you have a different workflow for the E-Mail Activation, e.g. to use
•Different Response Text
•Different Activation Servers
•Different E-Mail Forwarding options
•Different Schedules
Normally, you would only have one Default workflow rule.
Press Edit to edit a workflow rule
Press New to create a new workflow rule
Press Delete to delete a existing workflow rule
To use different workflows, you need a different E-Mail address for incoming E-mail for every product.
For Hosting users, only one workflow rule is possible to avoid an overload of the server.