[mrtg] Threshold problems

[Giovanni Gimelli]

I've configured mrtg config file to evaluate threshold:
(...)
ThreshDesc[rete131]: 131
ThreshMaxI[rete131]: 25k
ThreshProgI[rete131]: /home/httpd/html/mrtg/soglie/script/131over25k

The Perl script /home/httpd/html/mrtg/soglie/script/131over25k is:

#!/usr/bin/perl                         
$Addressee = "<username at popserver>";        
$Mailer = "/bin/mail";
$Data = localtime;
$Soglia = "25 k";
#$Rete = 131;
open (MESSAGE,"| $Mailer -s "trespassed threshhold" $Addressee");
print MESSAGE <<FINE
$Soglia threshold has been trespassed on $ENV{THRESH_DESC} network.
$Data.

message sent to $Addressee from Mrtg
FINE

But message arrived to <username at popserver> don't contains
$ENV{THRESH_DESC} variable descripted in config.html file.
How can I do to pass it to script?
Thanks.
Giovanni

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