How to read content of attachment from outgoing mail

Hello All,

I m developing a zreport which read all email going out of sap ,in order to read contain of the attachment m using FM "SO_ATTACHMENT_READ_API1'  by passing the attachment ID ,but the table parameter which contain the attachment content is return some junk value.Any other suggest FM or class which fulfill the purpose or any idea how to read the contain of a particular attachments in sap.

Thanks

Sam