Some implementations of Unix support a
higher level of security called C2. In general, such sites are
governmental or industrial where security is of high concern.
SecureWare is a commercial
add-on available for many architectures, most notably SCO Unix.
Now that SCO has split into two new companies,
SecureWare is no longer
available. This SECUREWARE compile-time macro has been retained,
however, because those sites that have already installed it will use
If sendmail is built with this SECUREWARE
compile-time macro defined, it will perform delivery under the
identity of the luid of the recipient. In
general, this SECUREWARE compile-time macro is correctly defined for
those systems that are known to use it.
If you are running a precompiled version of
sendmail, you can determine whether SECUREWARE
was included by using the -d0.10 debugging switch
(-d0.1) (if it appears in the list, support