Adherence to Internet RFCs

Standards

SLmail is built entirely on open Internet standards instead of locked-in proprietary protocols. These open protocols allow everyone's software to work together.

Internet protocols are specified by documents called RFCs (Requests for Comments). SLmail adheres to essentially all the RFCs that relate to mail handling in any way, including the following:

• RFC 821 - Simple Mail Transport Protocol

• RFC 822 - Internet Mail Format (types of addressing)

• RFC 876 - Survey of SMTP Implementations

• RFC 1123 - Requirements for Internet Hosts

• RFC 1153 - Digest Method Format

• RFC 1288 - Finger Access Protocol

• RFC 1339 - Remote Mail Checking Protocol

• RFC 1651 - SMTP service extensions (ESMTP)

• RFC 1653 - SMTP Extension for Message Size Declaration

• RFC 1725 - Post Office Protocol - Version 3

• RFC 1985 - Extended Turn

A protocol specified by Qualcomm (makers of Eudora™) for changing passwords from a mail client is also implemented.