In general you can sort a hash by value using a construct such as:

for my $key (sort {$hash{$a} cmp $hash{$b}} (keys %hash)) {
   print "Key = $key, Value = $hash{$key}\n";
}
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though I don't see why you want to do it in the code above.

update ok, I get it now... $message isn't in its final form above... I was wondering why you wanted the body of your email to consist of value sorted elements in the %ip2date hash.

-Blake