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WARNING: This plugin doesn’t currently work. Feel free to download it and 
figure out what’s wrong. The current bugs are:
<ul>
<li>It does not send out new comment/moderation notifications at all.</li>
<li>It sends out one copy of notifications generated by the Subscribe to Comments 
plugin for each person subscribed. (Fixed in trunk)</li>
</ul>
Mail Manager adds a plethora of new email notification options to WordPress 
for multiuser blogs. Instead of notifying the blog administrator or post 
author of all administrative activity, you can define who gets notified of 
what events, allowing for specific users to handle different administrative 
activities on a multiuser blog.
Notification options include:
<ul>
<li>New comments and comments awaiting moderation</li>
<li>Changes in post or page status (e.g. pending review) (future)</li>
<li>Changes in user status (future)</li>
</ul>
Mail Manager is compatible with WordPress 2.0 and later and WordPress MU 
1.0 and later.
Mail Manager is pre-release software and is missing planned features, and 
almost certainly has bugs. Please report any bugs you may find.
<h3>Release Notes</h3>
<ul>
<li>Upon first installation, notification of new comments and comments 
awaiting moderation may be disabled. You may need to visit Settings > 
Mail Manager immediately to re-enable notifications.</li>
</ul>

Mail Manager

Mail Manager allows customization of the recipients of administrative email
messages and provides new notification options.

TrustedLogin

The easiest and safest way to restrict access to your WordPress site’s Dashboard and administrative menus. Remove Dashboard Access is a lightweight plugin that automatically redirects users who shouldn’t have access to the Dashboard to a custom URL of your choosing. Redirects can also be configured on a per-role/per-capability basis, allowing you to keep certain users out of the Dashboard, while retaining access for others.
<ul>
<li>Limit Dashboard access to user roles:
<ul>
<li>Admins only</li>
<li>Admins + editors</li>
<li>Admins, editors, and authors</li>
<li>or restrict by specific user capability</li>
</ul>
</li>
<li>Choose your own redirect URL</li>
<li>Optionally allow users to edit their profiles</li>
<li>Display a message on the login screen so users know why they’re being redirected</li>
</ul>
Blocking access to the Dashboard is a great way to prevent clients from breaking their sites, prevent users from seeing things they shouldn’t, and to keep your site’s backend more secure.
Allow only users with roles or capabilities:
You can restrict Dashboard access to Admins only, Editors or above, Authors or above, or by selecting a specific user capability.
Grant access to user profiles:
Optionally allow all users the ability to edit their profiles in the Dashboard. Users lacking the chosen capability won’t be able to access any other sections of the Dashboard.
Show a custom login message:
<ul>
<li>Supply a message to display on the login screen. Leaving this blank disables the message.</li>
</ul>

Remove Dashboard Access

This plugin is a must-have when working with public roles.

A must-have!

Disable Dashboard access for users of a specific role or capability. Disallowed users are redirected to a chosen URL. Get set up in seconds.

Mail Manager vs Remove Dashboard Access