Purpose
This application component links the R/3 mail system to the Internet. It enables R/3 users or R/3 applications to send electronic messages to Internet addresses or to receive them in the R/3 System. The connection is via the standard protocol used in the Internet, SMTP (Simple Mail Transport Protocol).
Introduction notes
In addition to the SAP Internet Mail Gateway contained in the R/3 standard system, a
Mailing program is required for connection to the Internet.If you protect your R/3 System via a firewall, you can regulate access to the Internet via a proxy. In this case, the connections are controlled with the
SAProuter.
Integration
The Internet Mail Gateway supplied by SAP is one of the possibilities of linking the R/3 mail system to the Internet:

The connection is via RFC to the R/3 communication interface
SAPconnect. This allows the SAP Internet Mail Gateway to send messages from the
Business Workplace and directly from R/3 applications.
This documentation describes
Planning the Internet link, the Structure, the Installation and the Configuration of the SAP Internet Mail Gateway and contains notes on Testing and on Error analysis.