SAP support SMTP from WebAs 6.20 and higher.
As of SAP Web Application Server 6.20, faxes and text messages (pager/SMS) can also be exchanged via SMTP. For this purpose, the faxes and messages are packed into e-mails. For sending, the mail server refers to the domain of their recipients' addresses and forwards the e-mails either to an internal fax/text message server.