This plugin when activated automatically redirects all email sent through wp_mail/phpmailer to the user currently logged in or the site administrator.
The redirected email contains information about where the original email would have been sent to.
Use this plugin if you want to test email-sending features without actually sending emails our to anyone but yourself. I wrote this plugin to ease debugging with subscribe2.
Since Version 1.2 you can choose whether to redirect all email to the currently logged in user (default), the site administrator (only wpmu) or the blog administrator.

Mail Debug

Redirects all email sent through wordpress to the user currently logged in or the site administrator.

Scott Reilly

Configure SMTP mailing in WordPress, including support for sending email via SSL/TLS (such as Gmail).
This plugin is the official successor to the original SMTP plugin for WordPress (wpPHPMailer).
Use this plugin to customize the SMTP mailing system used by default by WordPress to handle outgoing emails. It offers you the ability to specify:
<ul>
<li>SMTP host name</li>
<li>SMTP port number</li>
<li>If SMTPAuth (authentication) should be used</li>
<li>SMTP username</li>
<li>SMTP password</li>
<li>If the SMTP connection needs to occur over ssl or tls</li>
</ul>
In addition, you can instead indicate that you wish to use Gmail to handle outgoing email, in which case the above settings are automatically configured to values appropriate for Gmail, though you’ll need to specify your Gmail email address (including the “@gmail.com”) and password.
Regardless of whether SMTP is enabled, the plugin provides you the ability to define the name and email of the ‘From:’ field for all outgoing emails.
A simple test button is also available that allows you to send a test email to yourself to check if sending email has been properly configured for your site.
Links: <a href="https://coffee2code.com/wp-plugins/configure-smtp/" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/configure-smtp/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/configure-smtp/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com" rel="nofollow ugc">Author Homepage</a>

Configure SMTP

does exactly what it says. Been working like a charm 

simple and sweet

Most of my users and customers ask me: why my mails are not being sent? Why some mails sent from my site do not arrives?

The problem are spam filters and things like this, so SMTP is a basic tool to operate a site or ecommerce.

I have used many plugin to do this task but none like this. This solves the problem in an easy and functional way.

Simple and functional way to configure SMTP settings in your WordPress

Configure SMTP mailing in WordPress, including support for sending email via SSL/TLS (such as Gmail).

Mail Debug vs Configure SMTP