Check if all is ok:
::> system node autosupport check show -node
Check the 'To:emails, mailhost, from etc' if they are correct:
::>autosupport show -node <node name> -instance
Trigger:
From the ONTAP command-line interface, send an AutoSupport test message to a trusted email address that you have access to:
::> system node autosupport invoke -node local -type test
https://docs.netapp.com/us-en/ontap/system-admin/troubleshoot-autosupport-delivery-smtp-task.html