SMTP.com

<p><a href="https://smtp.com" rel="nofollow ugc">SMTP.com</a> was the first company to provide email delivery at scale for customers unsatisfied with traditional sending methods. With over 22 years of email delivery success, SMTP.com is the trusted transactional and email relay provider for over 100,000 businesses worldwide. This WordPress integration for SMTP.com enables you to send and track your emails seamlessly.</p>
<p>Don’t worry about maintaining your email server or taking care of its IP reputation, forget about dealing with ISPs like Gmail, Yahoo or Microsoft in attempting to understand why your email isn’t reaching its destination. SMTP.com manages all this on your behalf. Simply create a SMTP.com account to <a href="https://registration.smtp.com/?afid=wpplugin" rel="nofollow ugc">get started</a> and set up this plugin. Although this plugin is free you will need a paid subscription with SMTP.com to send emails from your WordPress site.</p>
<p>You can send emails from your WordPress site using the SMTP.com API or the standard SMTP protocol. Our plugin will suggest the best way for you to send email even if your provider has restricted access to outbound internet ports. Either way, SMTP.com will still ensure your email gets delivered.</p>
<p>Another useful feature provided with our WordPress plugin is the ability to track your email delivery from within the plugin itself. See the results of your recent sends to ensure successful delivery or identify the reason why your particular email hasn’t been delivered.</p>



Didn't work with the API key, but managed with the login information.


Good

SMTP.com is a powerful and reliable SMTP delivery service that enables you to send and track high volume emails effortlessly.

Zoho Mail

<h4>Zoho Mail for WordPress</h4>
<p>Zoho Mail Plugin helps you to configure your Zoho Mail account in your WordPress site, to send emails from your Site.<br />
It is recommended to use authorized server for sending emails from websites, instead of using generic hosting servers. It is possible to misuse unauthorized and unauthenticated configuration and harm the reputation of your domain/ website when using generic servers.<br />
Zoho Mail plugin can help to ensure that the emails are sent from your account using Zoho Mail API’s.</p>
<h3>PRE-REQUISITES</h3>
<ul>
<li>A Zoho Mail Account</li>
<li>A self-hosted WordPress site</li>
<li>PHP 5.6 or later</li>
</ul>
<h3>ADVANTAGES OF ZOHO MAIL PLUGIN</h3>
<ul>
<li>Zoho Mail plugin makes use of <strong>OAuth 2.0</strong> protocol to access Zoho Mail API. This ensures a highly secure authentication process where the Username or password is not stored so cannot be misused.</li>
<li>Zoho Mail plugin has customized the <strong>PHPMailer’s</strong> code library, used in WordPress for sending email.</li>
<li>By using <strong>’wp_mail’</strong> function of WordPress, Zoho Mail plugin handles the custom send mail action anywhere from the entire site, without having to change/ configure in every occurrence.</li>
</ul>
<h3>ZOHO MAIL API FEATURES</h3>
<ul>
<li>Zoho Mail API is authenticated using OAuth 2.0 protocol.</li>
<li>You can configure your Zoho Mail account in your website to send email using Zoho Mail API.</li>
<li>The emails sent will be available in the corresponding Zoho Mail account’s Sent folder.</li>
</ul>
<h3>ZOHO MAIL PLUGIN PARAMETERS</h3>
<ul>
<li><strong>Where is your account hosted?</strong> :The region where your Zoho Account data resides.</li>
<li><strong>Client ID</strong> :The Client ID of your Zoho Mail API.</li>
<li><strong>Client Secret</strong> : The Client secret of your API.</li>
<li><strong>Authorized Redirect URI</strong> : Authorized Redirect URL obtained from your website that is used to create Client ID.</li>
<li><strong>From Email Address</strong> :The Email address that will be used to send all the outgoing emails from your website.</li>
<li><strong>From Name</strong> :The Name that will be shown as the display name while sending all emails from your website.</li>
</ul>
<h3>ZOHO MAIL PLUGIN TEST EMAIL</h3>
<p>After configuration, you can test the plugin. Navigate to the Zoho Mail – Test Email page in your Website settings.<br />
– <strong>To</strong> : Email address of the recipient.<br />
– <strong>Subject</strong> : Subject of the email.<br />
– <strong>Content</strong> :The message or body of the email.</p>
<p>For in detail instructions on how to set up Zoho Mail plugin, visit <a href="https://www.zoho.com/mail/help/zohomail-plugin-for-wordpress.html" rel="nofollow ugc">Zoho Mail plugin page</a> .<br />
<strong>Note</strong> :<br />
Sending emails through Zoho Mail is subjective to our Usage Policy restrictions. Please refer to our Usage Policy details <a href="https://www.zoho.com/mail/help/usage-policy.html" rel="nofollow ugc">here</a>.</p>


Zoho Mail for WordPress

Zoho Mail Plugin lets you configure your Zoho Mail account on your WordPress site enabling you to send the email via Zoho Mail API.

SMTP.com vs Zoho Mail for WordPress