My issues are:-
1) I am not able to change my trailhead profile's email id which is uneditable.
2) I am not able to create new playground trailhead account for superbadge challenges

I'm creating a task + sending an email via process builder in salesforce classic based on some condition which is working fine in classic, but in Lightning experience  two emails are triggering one is standard & custom email on task creation, Can I suppress the standard mail functionality?