You can’t turn off or change the frequency of credit alert emails at this time. An alert is automatically sent when your balance drops to 2,000 credits or below. If your balance stays below this level, a follow-up alert will be sent after 3 days. The alert threshold and timing are set by default and can’t be adjusted.
Workaround:
You can set up email filters in Gmail, Outlook, or other email clients to move these alerts out of your inbox.