Use an SMTP server for sending email from your blog. Includes support for Gmail’s SMTP.
Send email notifications to multiple addresses (not just admin) when new comments are posted on your site.
Recovers lost comments by copy/pasteing your **new comment** notification emails
Create groups to organize your subscribed users and send them e-mails based on their groups or by user levels, capabilities or usernames. You can also
Authors and commenters type their email addresses in the usual format, but eMob makes it difficult for spammers to detect and harvest them.
Fixes a bug in Wordpress 2.2 when sending HTML mails.
Send automated email to your blog’s commenters everytime you reply their comments on the blog’s comment system.
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
TextMe sends a carbon-copy of all admin emails via a SMS text-message to a specified phone number.