Established 2017 — Trusted SMTP Service

Buy SMTP with
Bitcoin or Crypto

Fast, private, and reliable SMTP delivery. Ensure your emails reach inboxes every time. Pay securely with Bitcoin, USDT, Monero or other cryptocurrency.

99% Inbox Rate No-KYC Required 99.99% Uptime 10/10 Mail Tester Score 2 min Setup
Free Sign Up View Pricing
Transparent Pricing

Choose Your Plan

All plans include full SMTP support, high deliverability, and privacy-focused service. Paid annually.

Up to 5,000 emails / mo
$49
per year
  • Full SMTP support
  • High deliverability
  • No-KYC privacy
  • Bitcoin / Crypto payment
Up to 10,000 emails / mo
$79
per year
  • Full SMTP support
  • High deliverability
  • No-KYC privacy
  • Bitcoin / Crypto payment
Up to 20,000 emails / mo
$159
per year
  • Full SMTP support
  • High deliverability
  • No-KYC privacy
  • Bitcoin / Crypto payment
20,000+ emails / mo
Custom
contact us
  • Dedicated IP option
  • High-volume ready
  • Priority support
  • Tailored solution
See Full Pricing & Plans →

7-day free trial — no credit card required

Why KingSMTP

Built for businesses that need
reliable delivery

📬
High Deliverability

Our clean IP addresses and optimized sending practices maximize inbox placement, ensuring your critical messages arrive reliably.

99% Inbox Rate 10/10 Mail Tester
🔒
Privacy & Security First

Unlike large providers, we don't scan, sell, or analyze your emails. Your data stays private, and you can pay with crypto for complete privacy.

No-KYC No IP Leak Crypto Payments
⚡
Easy Integration

Connect KingSMTP to websites, apps, or custom platforms effortlessly. Supports WordPress, major programming languages, and popular CMS platforms.

Simple API WordPress Plugin 2-min Setup
💬
Dedicated Support

Fast, personal assistance for setup, troubleshooting, or scaling your SMTP service. Real humans who care about your deliverability.

Email Support Telegram Expert Guidance
Features

Everything you need to
send with confidence

Transactional emails: order confirmations & notifications
Password resets & account alerts
Inbound & outbound email routing
Email analytics & visual dashboard
Dedicated IP option available
High-volume ready infrastructure
WordPress and cPanel support
No-KYC, privacy-focused
Bitcoin, USDT, Monero & more
DKIM & SPF support built-in
MX Routing for inbound emails
Email API included in all plans
Comparison

The best alternative to
Mandrill, Mailgun & Mailjet

Feature KingSMTP Mandrill / Mailgun / Mailjet
Privacy-focused ✓ Your data stays private ✗ May scan or analyze emails
Crypto Payments ✓ Bitcoin, USDT ✗ Rarely accepted
Easy Setup ✓ Simple API, WordPress plugin ⚠ Can be complex
Dedicated Support ✓ Fast, personal support ⚠ Often slow, ticket-based
Transparent Pricing ✓ No hidden fees ⚠ Extra fees for IPs or overages
Inbox Deliverability ✓ Optimized IPs, high inbox rate ⚠ Shared IPs can affect delivery
Getting Started

Up and running in
2 minutes

01
Sign Up

Create your account in minutes. No credit card required for the 7-day free trial.

02
Set Up Your Domain

Add a couple DNS records so we know you own the domain you claim to be sending emails from.

03
Integrate Your App

Use our API or plugins to connect your website, app or CMS. WordPress plugin available.

04
Start Sending

Reliable emails, every time. Monitor delivery in your dashboard with full logs.

Start Your Free Trial
Trusted Since 2017

Proven by businesses
worldwide

4.5
★★★★½
Overall on Capterra
Ease of Use
★★★★★
Customer Service
★★★★★
Features
★★★★★
Value for Money
★★★★★
View Capterra profile →
Mail Tester Score — 10/10 Perfect
Mail Tester Score 10/10
Dashboard — View & troubleshoot emails
KingSMTP Dashboard
Email Intelligence

Deep insights into every
email you send

Click on any email in your dashboard to see complete details — spam check results, spam score breakdown, incoming/outgoing message details, and full SMTP transaction logs. Pre-configured in your account from day one.

  • Recent processed emails with full metadata
  • Spam score analysis per message
  • Full email headers and content
  • Delivery status tracking
  • Complete SMTP transaction logs
Spam Analysis
Spam Score Breakdown
Knowledge Base

What is SMTP?

SMTP (Simple Mail Transfer Protocol) is the standard method used to send emails from one server to another. It acts like the digital postal system for the internet, ensuring messages are correctly routed and delivered to the right inbox. Whether it's a personal email, a business notification, or a password reset link, SMTP ensures that the message travels securely and efficiently from sender to recipient.

Why

Why Users Search for KingSMTP

With KingSMTP, you get a trusted, high-performance SMTP service that meets your budget, payment preference, and privacy needs.

Use cases

Buy SMTP with Bitcoin, USDT, Monero or other cryptocurrency Privacy-focused SMTP service Reliable transactional email delivery Alternative to Mandrill, Mailgun, or Mailjet
About

About KingSMTP

KingSMTP.com (formerly Kingmailer.co, founded in 2017) is a privacy-focused SMTP service provider designed to help businesses reliably send transactional emails. We're built for developers, startups, and businesses that value privacy, reliability, and the freedom to pay with cryptocurrency.

Important: KingSMTP is designed for transactional emails only — not mass email campaigns or marketing newsletters.

Use cases

Order confirmations Password resets Shipping updates Account alerts System notifications
At a Glance

Benefits & Features

Price per yearStarting at $49
Crypto PaymentsYes – Bitcoin, USDT, and other cryptocurrencies
Inbox Rate99%
Transactional EmailsYes
Bulk / Mass EmailingNot supported
API IncludedYes
MX RoutingYes
DKIM & SPF SupportYes
Setup Time2 minutes
Free TrialYes – 7 days, no credit card required
Customer SupportEmail & Telegram
WordPress PluginYes, "Kingmailer SMTP" on WordPress directory
Privacy FocusedYes – No-KYC, no email scanning
FAQ

Frequently asked
questions

Can I buy SMTP with Bitcoin, USDT, Ethereum, or other crypto?
Yes, you can buy SMTP with Bitcoin, USDT, Ethereum, Doge, or other cryptocurrencies.
Is there a recipients limit?
Paid accounts have no recipients limit.
Is this only for transactional emails?
Yes, this service is designed for transactional emails only. Contact us if you need to adjust your free trial limits.
How much does the SMTP service cost?
Yearly plans start from $49 per year for up to 5,000 emails per month.
Can I use this SMTP for MX routing?
Yes, you can use our SMTP service for MX routing. We'll help you configure it.
Can I send mass/bulk email?
No. We do not offer our service for mass or bulk mail campaigns. Transactional only.
Will I get my own SMTP username and password?
Yes. After signup and domain verification, you'll get your own SMTP credentials, dashboard access, and Email API.
Can I use a WordPress SMTP plugin?
Yes! Our "Kingmailer SMTP" plugin uses HTTP so it works even when port 25 is blocked. Find it in the WordPress directory.
Do I need my own domain?
Yes. You'll need your own domain with SPF and DKIM DNS records to start sending transactional emails.
Is there a forever free plan?
No, but you get a 7-day free trial with no credit card required.
Will my emails land in spam?
We maintain a 99% inbox rate with clean IPs and optimized sending infrastructure.
Can I receive emails too?
Yes. Add our MX records to your DNS and configure routing. We'll help you with the full setup.

Ready to get started?

Join businesses worldwide who trust KingSMTP for reliable, private email delivery.

Sign Up Free – No Credit Card Required
✉ support [at] kingsmtp [dot] com ✈ @KingSMTPcom on Telegram