Queries related to defender for office 365

Hello MDO gurus,

I have below queries for my defender for office deployment:

• Do we have feature to enable domain specific tagging for MDO Alerts.
• As for MDO Pending Action items, is there any default action application if we do not approve or reject the Soft-delete emails ?
• Are manually reported phishing emails part of the MDO Pending Action Items ?
• Is there a bulk approval option for MDO pending action items ?