Make JIRA Software notifications less noisy

We are using agile boards for planning customer projects. We want our customer to get notifications about effective changes to the task, but with every sprint they get tons of mails about changes of the sprint and the rank field. That is very annoying. We would really appreciate a possibility to suppress notifications for these

1) special fields
2) or during planning (like the checkbox you can use while changing multiple issues)
3) or GH at all

any of these solutions would be fine.