Hello Bhuvana,
I think the emails get deleted from the mailbox once a batch is created by SI
If you need a copy of the email stored in the mailbox, you may use Email Forwarding functionality (Where a copy of the received email was forwarded to a backup mailbox) or you may create a new folder inside your Inbox and push a copy of mail to the new folder from Inbox after which configure SI profile to pick emails from the new folder.
Hope the above helps.
Regards,
Naresh Kumar