AS2 Adapter

The AS2 Adapter enables data transfer using the AS2 protocol. AS2 (stands for Applicability Statement 2) is a protocol is used to transport data securely and reliably over the Internet, based on HTTP and S/MIME. The partners are always connected via the tried and tested HTTP(s) protocol. The AS2 process is a clear choice thanks to its effective firewall administration capability, signature, encryption, return receipt/acknowledgement (MDN) and rapid response times. Detailed information on the AS2 protocol can be found in RFC 4130. 

https://archive.sap.com/documents/docs/DOC-39563