SMTP for sending One-Time Password (OTP) email

If you are here, than ou are probably already familiar with one-time password emails (OTP). Our SMTP service is dedicated with transactional emails/application emails, such as “password reset” emails, and other e-commerce emails.

This makes our SMTP service perfect for one-time password emails (OTP). The SMTP service comes with a clean high reputation IP-address, which will help you in landing your important OTP emails in users’ inbox. Try it for free.

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One Time Password

In order to setup one time password, follow the steps in below.

First of all…

Our SMTP is solely dedicated to transactional emails and emails like OTP password reset emails

  1. To download/install WordPress SMTP plugin (in case you are using WordPress), visit
  2. To sign up for a free Kingmailer-account, visit

We’ll show you how to start sending OTP one time password reset emails.

You can use our SMTP service also for other CMS applications or merchant softwares.

The example below is for WordPress:

Time needed: 4 minutes

Install and activate the Kingmailer WordPress SMTP plugin

  1. Login as admin in your WordPress site

    If you are already logged in as admin, click on Plugins

  2. Click Add New

  3. Search Kingmailer SMTP

  4. Click Install Now

    After installing the plugin, click Activate.

  5. Go to plugin Settings

    Visit the plugin settings bij going to Settings > Kingmailer. Check the screenshot below to see how the plugin looks like, with description.

  6. Kingmailer API

    To make this work, you will also need the API (key). Check the screenshots/visuals below with description, after step 11.

  7. Go to Credentials

    This is the first step in creating your key (API). In your Kingmailer-account, go to Credentials, and click on Create credential

  8. Select API

    In the Type field, select API

  9. Name

    Give the API a name, this can be ExampleAPI

  10. Click Create credential

  11. Go to Credentials

    Now go to Credentials, click on ExampleAPI, and there you can copy the Key which you can use in your WordPress site.

This is how the plugin Settings looks like.

Enter your domain
From name
From Address
API key

Where do I find the API?

Login first into your Kingmailer account:

Add your credential
Click on the dropdown menu
API name
Create the API
Your Credential
Your API-key

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