DMARC policy for emails that fail SPF or DKIM
If a message fails SPF or DKIM validation and DMARC is enabled, this setting
determines how the receiving mail server should handle it. The options are :
- Take no action - The message is still delivered as normal.
- Quarantine email - This is recipient-dependent, but typically means that the message will be placed into a spam folder.
- Reject email - The message will be deleted.