Hi Sumit,
The question is not completely clear.
Either of the two things might have happened here.
- You've deleted the recipient schema
- You've deleted the underlying table.
If the table has been deleted, you can recover it from the last day's backup if you are maintaining it. In case the instance is Adobe hosted, we do take daily backups which are available for 7 days before being purged.
In case you have deleted the schema, please export the schema from another environment say the Dev instance and import it into the current affected environment. This step has to be followed if you had done customizations to factory recipient schema.
If you are using OOB version, please feel free to hit the Regenerate schema button.
Hope this helps.
Regards,
Vipul