KingSMTP review (2026): is it worth $20 a month?
SMTP relay you can pay for in crypto, with no KYC
Black Friday: is there a KingSMTP sale?
KingSMTP report card
Fair · out of 4.0 · graded Nov 12, 2026
Best for paying for SMTP in crypto with no ID check
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.
Who KingSMTP is for
- Fits if you want to pay in crypto without handing over ID
- Works for WordPress sites that want an SMTP relay and a plugin
Who KingSMTP is not for
- Skip it if you need a dedicated IP, as only shared IPs are listed
- Tight if you send over 100,000 emails a month, because the plans stop there and the rest is a custom plan
- Watch out: the pricing page lists crypto payment and does not say whether cards are accepted
- Watch out: the no-ID and no-scanning claims are the vendor's own statements
- Skip it if you want a free plan, since there is only the 7-day trial
Why KingSMTP gets a 2.0
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- CValue for money$20 a month for up to 20,000 emails, which is where the dearer quarter of sending services starts.
- CFree plan and trialA 7-day trial on all plans with no credit card; there is no free plan after it.
- CFeaturesSMTP 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.
- CEase of useNo 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.
- CPlatforms and integrationsA web dashboard, an API and a WordPress plugin; WordPress is the one named integration.
What these grades rest on. 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. How we review and grade.
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<a href="https://toolgpa.com/tools/kingsmtp#review"><img src="https://toolgpa.com/badge/kingsmtp.svg" alt="KingSMTP: 2.0 GPA on ToolGPA" width="196" height="56"></a>Where KingSMTP 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.
Each grade against the category
Every bar is all 27 email sending services we grade, cut by the letter each got. KingSMTP’s own letter is outlined.
- CValue for moneyAbove 3 of 26, level with 7
- CFree plan and trialAbove 4 of 26, level with 17
- CFeaturesAbove 0 of 26, level with 9
- CEase of useAbove 1 of 26, level with 25
- CPlatforms and integrationsAbove 0 of 26, level with 5
Price against what you get
Each dot is one of 26 email sending services. Further left costs less, and higher up scores better on features, ease of use and platforms. Point at a dot to see which tool it is.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Keep KingSMTP, 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.
What you could not
- Mail servers with a good name among inbox providers.
- It plugs into other products, WordPress among them, and has an API.
What this rests on. KingSMTP’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is KingSMTP?
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.
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.
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.
KingSMTP 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.
- Starts at
- $20 per month for up to 20,000 emails
- Free plan
- None
- Free trial
- 7-day free trial on all plans, no credit card required
| Plan | Price | What you get |
|---|---|---|
| Starter | $20per month for up to 20,000 emails | Full SMTP, HTTP API, email and Telegram support, and crypto payment. |
| Business | $50per 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 | $100per month for up to 100,000 emails | Adds shared IP, a custom domain and advanced analytics. Higher volumes are by custom plan. |
Read from kingsmtp.com on Nov 12, 2026. Prices change, so confirm with KingSMTP before you buy.
Ways to pay less
- Annual discountTwo months free with yearly billing
The pricing page shows yearly prices of $200, $500 and $1,000 for the three plans and labels them Save 2 months.
Stated on kingsmtp.com
Works with
KingSMTP alternatives
- KingSMTP vs SMTP2GO
Free plan · from $15/mo
- KingSMTP vs turboSMTP
Free plan · from $12.46/mo
- KingSMTP vs SMTP.com
From $25/mo
- KingSMTP vs Postmark
Free plan · from $15/mo
- KingSMTP vs Mailgun
Free plan · from $15/mo
Common questions
Does KingSMTP have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. KingSMTP is listed for Web.
Does KingSMTP have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. KingSMTP is listed for Web.
Is KingSMTP open source?
KingSMTP is not described as open source on its own site, as read on Nov 12, 2026.
Does KingSMTP have an API?
Yes. KingSMTP offers a public API, according to its own site.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 12, 2026.