Windows Mail extension
Description of the Windows® Mail extension.
This feature is deprecated, its use is discouraged although not prohibited.
Send mail using MAPI
MAPI is an acronym for Messaging Application Programming Interface. The MAPI extension creates a new mail in the default mailer software, which needs to be "MAPI" compatible, and requests user permission to send the mail. The mail sent using MAPI will be stored by the default mailer software in the same way as any other mail created by the user.
Send mail using an SMTP server
Another method of sending mail is to connect directly to a Simple Mail Transfer Protocol (SMTP) server (SMTP is the de facto standard for email transmission across the Internet). The extension will connect to a given SMTP server and send the mail through this server. The mail is not kept on the client side.