The following is my script. You basically run the script and specify two arguments when you run the script on the command line, a hostname (which would be your backup mail server) and the port (which is 25 for SMTP). This script flushes the queue if any. The only problem (which isn't really a problem) is the output that it prints to the screen. It prints the "220 WELCOME TO SMTP SERVER" line twice when it should only do it once. Anybody have any ideas/suggestions? 
-----------------------------------------------------------
#!/usr/bin/perl -w

use strict;
use IO::Socket;

my ($host, $port, $handle, $byte, $test);

unless (@ARGV == 2) { die "usage: $0 host port" }
($host, $port) = @ARGV;

$handle = IO::Socket::INET->new(Proto     => "tcp",
                                PeerAddr  => $host,
                                PeerPort  => $port)
        or die "can't connect to port $port on $host: $!";

print "[Connected to $host:$port]\n";

print $handle "ETRN mydomain.com\nQUIT\n";

while (sysread($handle, $byte, 1) == 1) {
        print STDOUT $byte;
}

close $handle;
-----------------------------------------------------------

[download]
It returns the following output: 
[bashprompt] perl flush-queue.pl mail.server.com 25

[Connected to mail.server.com:25]
220 mail.server.com ESMTP (Mail Server); Wed, 4 Sep 2002 09:57:41 -040
+0 (EDT)
250 2.0.0 Queuing for node mydomain.com started
221 2.0.0 mail.server.com closing connection
220 mail.server.com ESMTP (Mail Server); Wed, 4 Sep 2002 09:57:41 -040
+0 (EDT)

[bashprompt]

[download]

In reply to Socket output issue... by dascope

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