XMail is an Internet mail server and intranet with an SMTP server, POP3 server, finger server, multiple domains, no need for users to have a real system account, the SMTP relay checking, RBL / RSS / Orbs / DUL and custom (IP based and address based), protection against spam, SMTP authentication (PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom), a POP3 account Syncronize external POP3 accounts, account aliases, domain aliases, mail processing custom files direct mail delivery, mail filters custom lists dissemination, remote administration, custom mail exchangers, logging, and multi-source code.XMail platform compiler on GNU / Linux, FreeBSD, OpenBSD, NetBSD, OSX, Solaris and NT/2K/XP. Read the Readme.txt file included with the distribution. The project is distributed under the GPL, either version 2 or (at your option) any later version.