Just replacing the middle part:

# Above all others, add:
use strict;

# Some stuff here

my %connection = (
    pop3 => {
        PeerAddr => 'mail.test.com',
        PeerPort => 110,
    },
# Add the others here, like above
);

my %socket;
while (my ($name, $values) = each %connections)
{
    $socket{$name} = IO::Socket::INET->new(
        Timeout  => 1,
        Proto    => 'tcp',
        ( map { $_ => $values->{$_} } keys %$values ),
    );
}

my $UP   = 'Up';
my $DOWN = 'Down';

my $mail = ($socket{pop3} && $socket{smtp}
    ? $UP
    : $DOWN);

# Do other checks here
[download]

Oh - use CGI::Lite for your HTML outputting, or, better, use HTML::Template. Always try to separate presentation from logic.

------
We are the carpenters and bricklayers of the Information Age.

Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.