Version 4.12 of the Plugin is now available for download.
If you use this plugin consider making a donation to support future development!
Version 4.12 is for 2.6.x and 2.7.x users. (Although it should work with WordPress 2.5 too!) This version has been tested on WordPress 2.6.5, and 2.7.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
Version 4.11 of the Plugin is now available for download.
Version 4.11 is for 2.6.x users. (Although it should work with WordPress 2.5 and hopefully 2.7 too!) This version has been tested on WordPress 2.6.2, 2.7-almost-beta and WordPress MU 2.6.2.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
Version 4.10 of the Plugin is now available for download.
Version 4.10 is for 2.6.x users only! (Although it should work with WordPress 2.5 too!) This version has been tested on WordPress 2.6.1 and 2.6.2.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
Version 4.9 of the Plugin is now available for download.
Version 4.9 is for 2.6.x users only! (Although it should work with WordPress 2.5 too!) This version has been tested on WordPress 2.6 and 2.6.1.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
Version 4.8 of the Plugin is now available for download.
Version 4.8 is for 2.5.x users only! (Although it should work with WordPress 2.6 too!) This version has been tested on WordPress 2.5.1.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
I’m not going to be around for the next week or so because I’m going on holiday with my family! I won’t be checking in on my emails or this site very often (if at all) so try to avoid posting requests for help.
Have a good search on here, use google and try the WordPress forums. If you still feel the need to post on here or help bear in mind that I’ll be catching up on my return so please be patient.
Version 4.7 of the Plugin is now available for download.
Version 4.7 is for 2.5.x users only! This version has been tested on WordPress 2.5.1.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
By far the majority of requests for help are still something to do with emails – mainly not sending! This is normally down to server restrictions that are based on limitations to recipients per email or time based choking.
One potential way around this might be to channel your emails via an SMTP server so the plugin below might be worth a try. Amend the plugin code below with your smtp server, your usewrname and password. Upload it and activate it then try sending your notifications. If it works send some kudos (or hard cash) my way! 
<?php
/*
Plugin Name: SMTP Mailer
Plugin URI: http://subscribe2.wordpress.com
Description: Allows wp_mail() to send via SMTP server.
Version: 1.0
Author: Matthew Robinson
Author URI: http://subscribe2.wordpress.com
*/
/*
Copyright (C) 2006-8 Matthew Robinson
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
http://www.gnu.org/licenses/gpl.html
*/
/*
Instructions
1/ Change 'smtp.domain.com' to the server name of you out-going email server
2/ Change 'my_username' to your email mailbox username
3/ Change 'my_password' to your email mailbaox password
4/ Save this file and upload it to wp-content/plugins, then activate the plugin as normal
5/ Test is works by emailing a notification via Write->Subscribers in the Subscribe2 plugin
*/
add_action('phpmailer_init', 'wp_mail_to_smtp');
function wp_mail_to_smtp(&$phpmailer) {
$phpmailer->Mailer = 'smtp';
$phpmailer->SMTPAuth = true;
$phpmailer->Host = 'smtp.domain.com';
$phpmailer->Port = '25';
$phpmailer->Username = 'my_username';
$phpmailer->Password = 'my_password';
}
?>
Version 4.6 of the Plugin is now available for download.
Version 4.6 is for WordPress 2.3.x and 2.5.x users only! This version has been tested on WordPress 2.5.
Users of WordPress 2.0.x should download Version 2.22 of Subscribe2. Users of WordPress 2.1.x and 2.2.x should download Version 3.8.
Well, it seems that WordPress 2.5 and Subscribe2 4.5 are being used massively judging by the rapid number of comments on the release of the latest version of this plugin 
There appear to be 4 major problems people are running into:
Fatal Errors:
This is most likely being caused by conflicts with other plugins that use buttonsnap.php. To fix this look at around line 50 in subscribe2.php for the following code:
require(ABSPATH . 'wp-content/plugins/subscribe2/include/buttonsnap.php');
And replace it with:
if (!function_exists(buttonsnap_textbutton)) {
require(ABSPATH . 'wp-content/plugins/subscribe2/include/buttonsnap.php');
}
Missing Profile Page:
This is a bug introduced by the new menu system in WordPress 2.5. Either use a Drop Down Menu Plugin or apply the fix I submitted to the trac.
Missing Emails:
I’ve gone back to using wp_mail() in this release and it’s working fine for me. If you are having problems go back to mail() by replacing instances of @wp_mail( with @mail( in the subscribe2.php file. Also, read this post and contact your site host about email restrictions and ask them to look at the server logs.
Altered Page Titles:
Again, this is a bug in the WordPress code files. See here for the fix.
