# KingSMTP review (2026): is it worth $20 a month? > SMTP relay you can pay for in crypto, with no KYC Checked Nov 12, 2026 ยท graded Nov 12, 2026 by ToolGPA. KingSMTP is a privacy-focused SMTP relay and HTTP API for transactional email, run by an independent, bootstrapped team that says it launched in 2017. Its pages say there is no identity verification at sign-up and that it does not scan or sell message content. Plans are priced by monthly email volume, and the pricing page lists Bitcoin, USDT and Monero. - **Category:** Email Sending Services - **Made by:** KingSMTP (since 2017) - **Website:** https://kingsmtp.com - **Runs on:** Web - **Who should skip it:** Skip it if you need a dedicated IP, as only shared IPs are listed. - **Facts last checked:** Nov 12, 2026 ## Pricing As of Nov 12, 2026, KingSMTP is a paid product with a free trial, starting at $20 per month for up to 20,000 emails. - **Pricing model:** Free trial - **Free plan:** None. - **Free trial:** 7-day free trial on all plans, no credit card required. | Plan | Price | What you get | | --- | --- | --- | | Starter | $20 per month for up to 20,000 emails | Full SMTP, HTTP API, email and Telegram support, and crypto payment. | | Business | $50 per month for up to 50,000 emails | Adds MX routing for inbound, priority support, an analytics dashboard, a WordPress plugin and a shared IP option. | | Growth | $100 per month for up to 100,000 emails | Adds shared IP, a custom domain and advanced analytics. Higher volumes are by custom plan. | Read from https://kingsmtp.com on Nov 12, 2026. Prices change, so confirm with KingSMTP before buying. ## Ways to pay less - **Two months free with yearly billing** (Annual discount): The pricing page shows yearly prices of $200, $500 and $1,000 for the three plans and labels them Save 2 months. Source: https://kingsmtp.com ## Key features - **SMTP and HTTP API:** Connect an app, CMS or WordPress site through SMTP or the HTTP API, with DKIM and SPF included. - **Per-email dashboard:** Shows delivery status, spam scores, headers and the full SMTP transaction log for each message. - **Crypto payment, no KYC:** The site lists Bitcoin, USDT and Monero and says sign-up needs no identity verification. - **Inbound routing:** Business and Growth add MX routing for inbound mail. - **WordPress plugin:** A KingSMTP plugin is available from the WordPress directory and is included from the Business plan. ## Good for - Senders who want to pay in cryptocurrency - Small apps and WordPress sites that need a simple SMTP relay - People who want to avoid identity checks at sign-up ## Worth knowing - The pricing page lists crypto payment; it does not say whether cards are accepted. - Volume is capped per plan at 20,000, 50,000 or 100,000 emails a month; anything more is a custom plan. - Plan feature lists mention a shared IP option, and no dedicated IP is listed. - The no-KYC and no-scanning claims are the vendor's own statements. ## ToolGPA grades **GPA: 2.0 out of 4**, graded Nov 12, 2026. KingSMTP is an SMTP relay and HTTP API that takes crypto payment and says it asks for no ID. It starts at $20 a month for 20,000 emails after a 7-day trial, but there is no free plan, only a shared IP option is listed, and the privacy claims are the vendor's own words. - **Value for money: C.** $20 a month for up to 20,000 emails, which is where the dearer quarter of sending services starts. - **Free plan and trial: C.** A 7-day trial on all plans with no credit card; there is no free plan after it. - **Features: C.** SMTP and an HTTP API, a per-email dashboard, inbound routing and a WordPress plugin, but only a shared IP option and no dedicated IP in the listing. - **Ease of use: C.** No store rating on record. You verify a sending domain with DNS records and wire up SMTP credentials or an API key before the first email goes out. - **Platforms and integrations: C.** A web dashboard, an API and a WordPress plugin; WordPress is the one named integration. These are ToolGPA's own grades. Graded from this listing, whose facts were read from KingSMTP's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among email sending services - KingSMTP's GPA of 2.0 is higher than 2 of the 26 other email sending services we grade, and level with 1. - Its paid plans start at $20 a month, against a middle price of $13.73 for the category: 20 of the 25 others that charge start lower. - On features, ease of use and platforms it scores 2.0 out of 4. 17 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/email-sending ## Keep it, or make your own? **Keep it.** To replace KingSMTP you would be making mail servers with a good name among inbox providers. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 23 of the 26 other email sending services grade higher. It costs $240 a year. - You could not: Mail servers with a good name among inbox providers. - You could not: It plugs into other products, WordPress among them, and has an API. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with WordPress **Tags:** Transactional email, Public API ## Alternatives - [SMTP2GO](https://toolgpa.com/tools/smtp2go): SMTP relay and email API priced by emails a month, with a free plan. [Compare](https://toolgpa.com/compare/kingsmtp-vs-smtp2go) - [turboSMTP](https://toolgpa.com/tools/turbosmtp): SMTP relay and email API on European infrastructure, with a free plan. [Compare](https://toolgpa.com/compare/kingsmtp-vs-turbosmtp) - [SMTP.com](https://toolgpa.com/tools/smtp-com): SMTP relay and email API sold in monthly volume plans from 50,000. [Compare](https://toolgpa.com/compare/kingsmtp-vs-smtp-com) - [Postmark](https://toolgpa.com/tools/postmark): Transactional email API and SMTP, with broadcasts on a separate stream. [Compare](https://toolgpa.com/compare/kingsmtp-vs-postmark) - [Mailgun](https://toolgpa.com/tools/mailgun): Email API and SMTP relay for developers, with list validation. [Compare](https://toolgpa.com/compare/kingsmtp-vs-mailgun) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 12, 2026: - https://kingsmtp.com - https://kingsmtp.com/about Page: https://toolgpa.com/tools/kingsmtp Listed by ToolGPA (toolgpa.com).