the script fail during the prime parcourt of the loop I made ​​some minor changes to the code

print "connecting to $server..\n";
my $pop = Net::POP3->new($server, Port => 995)
  or die "error: can't connect to $server: $!\n";
print "ok\n";
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this is my error to stderr

localhost ~]$ perl deletemailpop3s.pl
connecting to pop.wanadoo.fr..
ok
Use of uninitialized value in concatenation (.) or string at deletemai
+lpop3s.pl line 28.
mail box size: 12914033
313 unread mail(s).
last read mail was number

Use of uninitialized value in numeric eq (==) at /usr/lib/perl5/5.8.8/
+Net/POP3.pm line 311.
Use of uninitialized value in numeric eq (==) at /usr/lib/perl5/5.8.8/
+Net/POP3.pm line 311.
...etc...
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Examining the first waarning message and the following output indicates that $last is undef which implies that my $last = $pop->last; failed. The following warnings pertaining to badness inside POP3.pm is pretty much consistent with $pop already being in a bad state.

What did the code look before you changed it?

True laziness is hard work