Mail

This module creates a "Watchlist" tab for each user, which allows the ability to configure granular e-mail notifications based on 1.) the user performing the action, 2.) the content type of the node being affected, and 3.) the action being performed on the node.

The Watchlist Form

User details
The first section in the Watchlist form is titled "User details". It allows you to choose to receive e-mail from a.) everyone, b.) ONLY listed users, or c.) everyone EXCEPT listed users. Then, based on the option that has been selected, the current user is able to create a list of other users to apply this filter to. For example, in the screenshot, the current user has chosen "Show updates from: ONLY the user(s) listed below...", and has selected the users "Chris" and "Ross". This means that the current user will receive e-mail notifications based on the actions of only these two users, and no one else.

Content details
The second section in the Watchlist form is titled "Content details".
It contains a matrix of content types and actions, and allows users to select when they would like to be notified. For example, in the screenshot, the current user has chosen to be notified when a node of the content type "checklist" is created or updated, but not when it is deleted.

This is simple module that sends out an email to the user upon password change.

The email is configurable at admin/user/settings.

This module allows you to create a Cyrus IMAP mailbox for each Drupal
user on the system.

This project will enable email centric templates to be loaded into Drupal, and then content loaded into configurable regions. This can then be emailed out using Drupal or exported into another mail sending service.

This module provides a message count block and a basic inbox for users' GMail accounts. The user must have IMAP access enabled for their GMail account in order to use this module.

The module allows users to view, delete, and send "auto-reply" messages. The auto-reply message is nice for users that recieve a lot of email and can't keep up with all new messages. The text used in the auto-reply can be set per user on the /user/$uid/edit page.

This module creates an image of a user's email address given the uid. It can be used in views, for example, to list users' email addresses as images instead of plain text, which can be picked up by bots for spamming.