Sendmail, Inc., and the Sendmail Consortium announce the availability
of sendmail X.0.0.0.0.

sendmail X is a message transfer system that has been designed with
these main topics in minds:

o security
o reliability
o efficiency
o configurability
o extendibility

sendmail X consists of five main modules of which only one runs
as root:

o mcp: the main control program is similar to inetd(8): it starts
  all other sendmail X modules and watches over their execution.
  mcp runs as root in order to bind to port 25 and to change the
  uid of the processes it starts.
o smtps: the SMTP server receives e-mails.
o smtpc: the SMTP client sends e-mails.
o smar: the address resolver provides lookups in various maps including
  DNS for mail routing.
o qmgr: the queue manager controls the flow of e-mails through the SMTP
  servers and clients.

All of these modules run persistently.  smtps and smtpc make use
of the statethreads library which provides a threading API well
suited for Internet applications, smar and qmgr use the POSIX
threads API.

The syntax of the sendmail X configuration file is very simple and
resembles C programs or the BIND 9 configuration files.  A configuration
file does not require any special layout, e.g., tabs or one option
per line, but relies on braces and semicolons as structuring elements.

The first release of sendmail X (X.0) is intended to be used as a
secure and efficient mail gateway. It offers features that are not
available in sendmail 8 (or some other open source MTAs), but it
does not provide any mail content modification capabilities, e.g.,
masquerading of addresses or changing (addition, removal) of headers.
Later versions will probably add such capabilities. Moreover, this
version of sendmail X does not come with a mail submission program
nor a local delivery agent. The documentation explains which programs
can be used to perform these tasks and how other features that are
not directly available can be implemented.

sendmail X.0 comes with a policy mail filter library (libpmilter)
which offers similar features as libmilter known from sendmail 8,
however, without mail content modification capabilities (as mentioned
before). Two milter programs have been ported to the pmilter API
and are available in the contrib directory.

All aspects of sendmail X (including installation, configuration,
and operation) are documented in a single README file which is
available in various formats (dvi, HTML, PostScript, PDF, and plain
text) such that the user can select the most appropriate format for
her needs.  Additionally, a design document is separately available
for background reading which also covers the implementation and
many other aspects.

The source code distribution and its PGP signature are available at:

ftp://ftp.sendmail.org/pub/sendmail/smX-0.0.0.0.tar.gz
ftp://ftp.sendmail.org/pub/sendmail/smX-0.0.0.0.tar.gz.sig

md5 checksums:
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MD5 (smX-0.0.0.0.tar.gz.sig) = 4ce6ccd37afcc00531c3050e99f66033

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