That sounds to me like a bad e-mail address. If the e-mail address was given in a double-quoted string, did you escape (i.e. backslash) the @? (If not, in addition to doing that, you should be running this under strict, because under strict an unescaped @ in a double-quoted string would have most likely caused the compilation to fail, thereby alerting you to the problem; it's a good thing to do in general.) And, as ikegami noted, what are the strings in $Version and $ID?

BTW, I tried a similar short script, and it worked fine; this is what I ran:

use strict;
use warnings;

my $address = 'myaddress@myhost.com';
my $subject = 'nothing';
system( "mail $address -s $subject < random.txt" ) == 0
  or die "mail failed: $?";
[download]

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