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Free SMTP server. Test our SMTP server. Free SMTP Username and Password.

What is allowed

Here's a list of email types that we allow at the moment, questions? Send us an email

Allowed Not allowed
Sign up emails Newsletters
Password reset emails Promotional emails
Notification emails Cold emails
Welcome emails Announcements
Transactional emails Marketing newsletters
Forum notifications Unsolicited emails
Invoice & receipt emails Spam

Compare pricing

Pricing based on 50,000 emails p/mo

  • Kingmailer: $5 p/mo or $55 p/year
  • MailChannels: $70 p/mo or $840 p/year
  • MailGun: $35 p/mo or $420 p/year
  • Sendgrid: $30 p/mo or $360 p/year
  • PostMarkApp: $50 p/mo or $600 p/year
  • SMTP2Go: $35 p/mo or $420 p/year
  • Mandrill: $50 p/mo or $600 p/year

Email delivery

How is the inbox delivery, you may ask?

We have great inbox delivery, and you can verify this yourself also.

All our customers are in the same IP pool and share the same IP pool, this makes our IP pool very strong and reputable, giving it very high inbox rates, and also because we do not allow spam.

  • We have a 80+ % Sender score on ReturnPath, for example see here
  • We  have a 10/10 Mail Tester score, see here
  • Our customers get a free clean IP address, not blacklisted, for example you can see here
  • We have 100% uptime, see here
  • Is it worth the $5 p/mo? Totally.

Do you need additional proof? We can supply, just email us.

Why users like Kingmailer

Here's a list of reasons why companies and developers use Kingmailer

  • Quick email integration
  • Free plan
  • Easy setup
  • Highly reliable
  • Extensive API
  • Great for parsing inbound emails
  • Easy to use UI
  • Excellent customer support
  • Email + WhatsApp support
  • Easy to view logs of sent emails
  • Easy to configure in Gmail
  • Bitcoin also accepted

All plans include

  • SMTP Username / Password
  • Email SSL
  • Data Recovery
  • Email Archive (180 days)
  • Free clean IP-address
  • Email Monitoring
  • Queue Manager
  • Response Management
  • Routing
  • Signature Management
  • Spam Blocker
  • Spam Check
  • Whitelisting / Blacklisting

Interview with Navin Poeran, CEO Kingmailer

Check our SMTP Mail Server presentation

Free SMTP Mail Server

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

Try for free.

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

Free SMTP Server demo

Why Choose Kingmailer?

Free SMTP server


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:

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.