try testing POSIX::uname to see if it works 
use POSIX;
$host = (POSIX::uname())[1];
print "$host\n";

[download]
it should try to use POSIX::uname after it tries the hostname command, but before it tries uname and /com/host commands. if that works, and you aren't too concerned about portability to non-POSIX systems, you could just use that instead of Sys::Hostname (it's even a standard module, so you don't have anything extra to install).

In reply to Re: Mail::Audit, sendmail, and Sys::Hostname: hostname fails in .forward by robobunny
in thread Mail::Audit, sendmail, and Sys::Hostname: hostname fails in .forward by FoxtrotUniform

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