This plugin enhances the security and stability of your WordPress installation by delaying and controlling wp_mail() email submissions through a managed queue.
If your site exhibits unusual behavior — such as a spam bot repeatedly submitting forms — you will be alerted immediately.
<ul>
<li>Intercepts wp_mail() and places outgoing messages in a queue</li>
<li>Configure how many emails are sent and at what interval</li>
<li>Log all queued email submissions</li>
<li>Receive alerts when the queue grows unexpectedly</li>
<li>Receive alerts when WordPress is unable to send emails</li>
</ul>

Mail Queue

Take control of emails sent by WordPress. Queue outgoing emails and get notified instantly if your website is trying to send too many emails at once!

Schedule YAPB images from a directory with an interval of time. 
Read iptcs set the title, body and tags. 
Perfect for photoblogging.
<h4>Typical usage</h4>
<ul>
<li>Edit your photos in your favorite editor (Lightroom, Aperture, etc.)</li>
<li>Be sure to edit your IPTC data</li>
<li>Upload your image with any FTP client to /wp-content/uploads/yapq-queue</li>
<li>Goto ‘Post’ section and you will see an ‘YAPB queue’ option</li>
<li>Enter the start date and the period of time between post</li>
<li>‘Process queue’… 🙂</li>
</ul>
Based on “YAPB Bulk Uploader” http://joost.reuzel.nl/about/plugins/

yapb-queue

Schedule YAPB images from a directory with an interval of time.

Mail Queue vs yapb-queue