Sun Microsystems has adopted V8.6 as its standard version of sendmail as of Solaris 2.5. It will adopt V8.8 when it releases Solaris 2.7. Here, we cover Sun's enhancements to V8.8 as planned for Solaris 2.7.
Sun Microsystems has modified V8.7 sendmail to meet three internal requirements. Each new release of Sun supported sendmail must do the following:
Be backward compatible with old, user configuration files
Support the advantages of Sun's operating system, such as NIS+
Allow for easy administration by naive system administrators
To meet these requirements, Sun adopted use of the
V configuration command (see Section 27.5, "The V Configuration Command") to indicate to sendmail how
the sendmail.cf file should be handled. V1/Sun and
V7/Sun are the two available versions. They are mutually
exclusive, which is to say that features that are available with one
are not available with the other.The only exception to this is a feature that is available
to both V1/Sun and V7/Sun, the
Content-Length: header (see
Section 35.10.7, Content-Length:). This is used to support
 Note that V7/Sun will be available only with Solaris 2.7. If your release of the operating system is earlier than Solaris 2.7, and if you wish to take advantage of new features and capabilities, you should obtain the V8.8 release from Berkeley (see Section 18.3, "Obtain the Source").
Sun Microsystems has enhanced V8.7 sendmail by adding two new configuration commands and introducing a few new macros. These enhancements are enabled when V7/Sun is in your configuration file. The V7/Sun enhancements are shown in Table 38.4.
Note that you cannot simply add V6/Sun to the top of your old configuration file to get these new enhancements. Instead, you must use the configuration file supplied by Sun that already contains the V6/Sun declaration.