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 and can optionally pause delivery automatically while you investigate.
<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>Pause the queue without disabling the plugin completely</li>
<li>Log queued emails, sent emails, alerts, and queue events</li>
<li>Receive alerts when the queue grows unexpectedly</li>
<li>Optionally auto-pause the queue when an alert is triggered</li>
<li>Send selected queued emails immediately from the backend</li>
<li>Automatically prioritize WordPress password reset emails</li>
<li>Receive alerts when WordPress is unable to send emails</li>
</ul>

Mail Queue

Gain full control over your WordPress emails. Queue outgoing emails and get alerts when your site tries to send unusually high volumes.

Milan Dinić

<a href="http://blog.milandinic.com/wordpress/plugins/post-to-queue/" rel="nofollow ugc">Plugin homepage</a> | <a href="http://blog.milandinic.com/" rel="nofollow ugc">Plugin author</a> | <a href="http://blog.milandinic.com/donate/" rel="nofollow ugc">Donate</a>
Don’t want to publish all of your posts at once but hate manual scheduling/rescheduling? Post to Queue comes as a solution. You just put posts to queue and they’ll be published automatically when chosen time passes since last published post of that post type. It’s even possible to choose days of the week and hours of the day when those posts will be published.
Post to Queue is like Buffer for WordPress, just better.
It requires that cron runs regularly to be able to publish posts on time.
Post to Queue code is partly based on a code from plugin <a href="https://wordpress.org/plugins/automatic-post-scheduler/" rel="ugc">Automatic Post Scheduler</a> by <a href="http://tudorsandu.ro/" rel="nofollow ugc">Tudor Sandu</a> and a code from plugin <a href="https://wordpress.org/plugins/metronet-reorder-posts/" rel="ugc">Metronet Reorder Posts</a> by <a href="http://www.ronalfy.com/" rel="nofollow ugc">Ronald Huereca</a> and <a href="https://geek.hellyer.kiwi/" rel="nofollow ugc">Ryan Hellyer</a> for <a href="http://www.metronet.no/" rel="nofollow ugc">Metronet Norge AS</a>.
And it’s on <a href="https://github.com/dimadin/post-to-queue" rel="nofollow ugc">GitHub</a>.

Post to Queue

Stack posts to queue and auto publish them in chosen interval and time frame.

Mail Queue vs Post to Queue