I use the rules scheduler module (D7). So far all fine.

What I use it for:

• a user registers with username and email
• this users then gets 4 emails over the next four weeks, sent by the scheduler

BUT: In case a user wants to unsubscribe from these scheduled emails? How can I achieve it?

It is true that one can delete particular sort of scheduled tasks with the according action (Delete scheduled tasks). But I don’t know how to indicate it shall only delete the tasks that are related to a particular?

When I list the schedule with … /admin/config/workflow/rules/schedule

… there is one column called “USER PROVIDED IDENTIFIER” – maybe it would help to do it with such an identifier. But I don’t know how?

UPDATE TO THE QUESTION:

I tried to import with the suggested changes, this is how my rule looks like now:

{ "rules_user_reminder_after_30_days" : { "LABEL" : "User Reminder After 30 Days", "PLUGIN" : "reaction rule", "OWNER" : "rules", "REQUIRES" : [ "rules", "rules_scheduler" ], "ON" : { "user_login" : [], "node_insert--article" : { "bundle" : "article" } }, "DO" : [   { "schedule_delete" : {       "component" : "rules_send_email_notification",       "task" : "[account:name]"     }   },   { "schedule" : {       "component" : "rules_send_email_notification",       "identifier" : "[account:name]",       "param_user_to_notify" : [ "account" ]     }   } ] } } 

But now I got this error:

Integrity check for the imported configuration failed. Error message: Missing configuration for parameter date