dont_send_mail does't let wordpress-mu send mail at all.
Mass Mail allows to wp bloggers to send mass mails to users groups.
Allow users to message each other. Like CMS Private messaging system and social websites.
wordpress thread comment
Send email to all administrators when update (WordPress or plugins) are available.
This plugin helps user to notify reply to previous commenter in same post via simply insert '@+user+blank' or '@+user+:' (like twi
This plugin is a simple newsletter plugin. It can show opt-in form, save opt-in email and name, and send emails to your opt-in list. It also have impo
A WordPress plugin that allows you to change the default firstname.lastname@example.org email address that WordPress sends it's email from, and the name of the
Mail Manager allows customization of the recipients of administrative email messages and provides new notification options.
This plugin give the ability to anyone how registered to your blog, to invite more people, even if the registration is closed.
Adds a 'Share This Post' button after each post. The share botton supports e-mail address book, social bookmarks and favorites.
Email batcher that takes all the emails that would normally get sent out individually, compiles them into just one email, then sends it out once a day
Fixes a bug in WordPress 2.2 when sending HTML mails.
Send mail in 5 different ways: PHP mail(), MX Zone, SMTP Relay, Command Line or POP before SMTP, also you can use your Gmail account to send mails.
Authors and commenters type their email addresses in the usual format, but eMob makes it difficult for spammers to detect and harvest them.
Use an SMTP server for sending email from your blog. Includes support for Gmail's SMTP.