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KingSMTP

Fast, private, and reliable SMTP for businesses.·kingsmtp.com

KingSMTP is a transactional SMTP relay service for sending emails such as password resets, order confirmations, receipts and account alerts. It requires no KYC identity verification, accepts payment in Bitcoin, USDT and Monero, and runs on the Postal mail server. The service offers SMTP and HTTP API access, inbound MX routing, per-message delivery logs and a dashboard for monitoring deliverability.

What it's for

Password resets and account verificationTwo-factor authentication (2FA) codesOrder confirmations and receiptsShipping notificationsAccount notifications and security alertsSystem-generated notificationsInvoice and billing emailsInbound email routing and forwarding (MX)

Features 16

10/10 mail-tester.com score
7-day free trial with 5-recipient test limit
99% inbox delivery rate
Cryptocurrency payments (Bitcoin, USDT, Monero)
Dedicated IP option for high, steady volume
DKIM & SPF support
Email and Telegram support
Email dashboard with delivery status, headers and spam score analysis
HTTP/RESTful API for sending email
Inbound email routing (MX records)
No-KYC signup (domain + use-case description only)
Per-message delivery logs with SMTP server response
Shared sending pool with established IP reputation
SMTP relay on ports 587, 465 and 2525
TLS encryption on connections
WordPress SMTP plugin

At a glance

free trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

LanguagesEnglish, Korean

Fordevelopers, small businesses

CompanyKingSMTP.com

Integrations

WordPress

Pricing

Custom pricing available for volumes over 100,000 emails/month, including dedicated IPs and volume discounts. Credit cards and PayPal are also accepted alongside crypto. Pricing may differ for higher-risk industries (e.g. gambling, crypto, adult content) due to additional monitoring needs.

Starter$20/mo

Annual billing: $200/year (save 2 months).

Up to 20,000 emails / month

Business$50/mo

Marked 'Most Popular'. Annual billing: $500/year (save 2 months).

Up to 50,000 emails / month

Growth$100/mo

Annual billing: $1000/year (save 2 months).

Up to 100,000 emails / month

Custom (100,000+ emails)Quote

Custom pricing on request; contact required.

For senders exceeding 100,000 emails/month