Free SMTP Server. Forever Free. Upgrade anytime.

$5 p/mo 50,000 emails

Check our SMTP Mail Server presentation

Free SMTP Mail Server

After signing up you will have your own SMTP username/password to get started.

Try for free. No credit card required. We accept USD, EURO and Bitcoin.

Questions? WhatsApp: +597-878-8413 Email:

Free SMTP Server demo

Why Choose Kingmailer?

Why pay more than $5 p/mo for SMTP service?


Easily integrate your transactional emails

Powerful SMTP API

SMTP Server

Plugins for WordPress, WooCommerce, Prestashop and many more.


Optimize the deliverability of your emails

Manage multiple domains

Monitor your emails reputation

Personalized SPF, DKIM and DMARC authentication


Track & Analyze Performance

History of all your messages with your contacts

Monitor email performance in real time

Get detailed statistics on opens, clicks, bounces, etc.


Have a question? Our support team is available 24/7/365.

Our email is:

Grow your business

Growing your business is not easy. You have undoubtedly found dozens of tools on the internet, with many functionalities.

Our goal is not to offer you a platform with features that you do not need or will use, but a platform that helps you grow your business. We are working to resolve your growth and marketing needs.

We would like you to spend as little time as possible on email marketing, leaving you more time for other activities within your business.


Free SMTP Features & Details

Real-time results
Get up-to-the-minute analytics on your message deliverability and engagement metrics.

Email statistics
Monitor all your email logs and statistics on deliverability, open rates, click rates and more.

Webhooks & Integrations
Manage your email statistics using webhooks and integrate Kingmailer SMTP with all your tools: WordPress, PrestaShop, WooCommerce and more.

Flexible SMTP APIs
Create customized, dynamic messages using a powerful API.

Optimal deliverability
Ensure your welcome messages, order confirmations, shipping notifications, app alerts, and other important emails reach the inbox.

Message Archiving & Logs
Archive and search historical transactional emails.


What payment types do you accept?

We accept payments via Bitcoin, Visa, Paypal, MasterCard, American Express, Diners, and JCB.

Do you accept Bitcoins?

Yes, we do.

Do I need to have a domain?

Yes. In order to be able to use our SMTP services, you will need to have your own domain. You will need to verify the domain and add a few DNS records, before it's good to go.

How do I upgrade?

To upgrade or downgrade your plan, please send us an email

Can I cancel my subscription?

You can cancel your subscription anytime, just send us an email

Can I upload my list here and start emailing?

No. We do not provide a way for customers to upload their subscribers onto our platform. We only provide the SMTP credentials and email relay services, that you can use with your own email marketing software or free email marketing plugin in your WordPress website.

Will my email go to spam/junk folder?

Most definitely not. BUT, if you are you sending unsolicited emails, the chances are high it will.

I bought a mailing list, can I send emails to it?

Actually no, as it will hurt our SMTP servers.

Can I connect this with Gmail, Yahoo, Hotmail etc?

Yes, this is possible. Just use the SMTP settings, and all emails will be relayed via our servers and sent to your email inbox. Make sure to configure the mx records first.

Can I request refund?

Yes, no problem, send us an email

Do you accept Western Union or banking transfers?

Kingmailer can accept these payment methods in certain situations. Please contact for assistance.