Sal Ferrarello

Stops outgoing emails sent from WordPress. This plugin stops 
outgoing emails generated by WordPress core, plugins, and themes. 
Emails sent using the <code>wp_mail()</code> function, will not be sent. 
In the case where an author does not use the recommended <code>wp_mail()</code> 
function and instead sends the email using another mechanism, an email will 
still be sent.
This plugin allows you to suspend sending emails when doing development work. 
Any calls to <code>wp_mail()</code> will fail silently. WordPress 
will operate as if the email were sent successfully 
but no email will actually be sent.
On the admin menu page Settings > Stop Emails, there is the option 
to log all emails to the PHP error log. By default this logging is 
disabled.
NOTE: If using the PHP <code>mail()</code> function directly, this 
plugin will NOT stop the emails.
Built by <a href="http://salferrarello.com/" rel="nofollow ugc">Sal Ferrarello</a> / <a href="http://twitter.com/salcode" rel="nofollow ugc">@salcode</a>

Stop Emails

Simply Works

This works great. I had used it months ago for something else. But I needed to migrate a Ning.com website with members into a new Buddypress site. I had to make sure the members were not emailed or pinged. This plugin stopped all outgoing emails to all the members.

Works Great!

Worked out of the box for me on a VPS; we were developing a system in parallel to an existing site and someone else installed this instead of using our existing process. I learned of a new plugin and a new way of doing things for WP. Very impressed.

Great turn-key solution

Excellent plugin! Easy, effective, bloatless.

Easy and Effective

Stop all outgoing emails sent from WordPress.

Ashish Kumar (Ashfame)

Prevents WordPress from sending out emails and save them so that you can preview them without actually having to send them. Best for checking or designing emails in development environment.
Please report any issues directly to Github repo – https://github.com/ashfame/email-cop/
Pull requests are welcome 🙂
Icon Credit: Cop icon – http://www.aha-soft.com/

Email Cop

I use this for all my local installs. It's so helpful and necessary. We recommend it to all our GiveWP users so they can test their emails on staging or locally without worrying that they'll end up blasting their donors. 

So great and easy and does its job well. Thanks!

So helpful and necessary

Prevents WordPress from sending out emails and save them so that you can preview them without actually having to send them.

Stop Emails vs Email Cop