I want to allow my members to send the SMS message via Email along with the normal mobile SMS message. Whatever the text typed in the text box should go as Email and also send as SMS
Yes, it is possible out of box.You can enable this from JEEMA SMS configuration(Configuration->Layout->Send Layout) .But remember that the email address of a contact is stored in the contact table. It will work only if you send SMS message by selecting the contacts from contact view and send SMS. If any of the contact doesn't have any email then it will only send SMS.