Receive email attchmnt, store in SAP & link to PO

Hi Experts,

We have a requirement to convert PO to PDF and send it as an e-mail attachment which is possible .

But the requirement is to add digital signature to the PO and send it as E-mail attachment.

Also once vendor confirms and signs the same document and scans it and send it through e-mail as attachment. This document should be stored in Sap and linked to PO.

I am working on ECC 6.0.

Any pointers to receive an email attachment, store in SAP & link to PO would be great.

Thanks,

Best regards,

Prashant