Hi Amala,
Assuming that you have set up the mail trigger already and that you have a default process that will be kick off when an email is received by the mailbox.
By default, the default process will have the following process variables when this process is trigger by an email: SenderAddress, SentDate, ReceivedDate, MailSubject,MessageNumber, MessageID and the MailBody, These variables will be found in a folder called SMTP in your process dataset and their corresponding values.
I hope this helps.
Thanks
Sivuyile