Mail Adapter
The mail adapter enables you to connect e-mail servers to the Integration Server or the PCK.
The receiver mail adapter converts XI messages to e-mails and uses the Simple Mail Transfer Protocol (SMTP) or the Internet Message Access Protocol (IMAP) to transfer them to the e-mail server. The sender mail adapter uses the Internet Message Access Protocol (IMAP) or the Post Office Protocol Version 3 (POP3) to collect e-mails and convert them to XI messages.
If an e-mail server is communicating with the mail adapter, you can configure security settings to encrypt/decrypt and sign/verify messages. Here, message security is based on the S/MIME internet standard (Secure Multipurpose Internet Mail Extension).

For FAQs about the mail adapter, see SAP Note 856599.
You configure the adapter in the configuration part of the Integration Builder/PCK.
· To send content from e-mail servers to the Integration Server/PCK, you configure the sender mail adapter.
· To convert XML messages from the Integration Server/PCK to e-mails, you configure the receiver mail adapter. The receiver adapter supports system acknowledgments but not application acknowledgments.