KingSMTP
Buy SMTP with Bitcoin
For context: I run KingSMTP.com — a transactional email service (no newsletters, no bulk).
For a long time, the product worked, but it felt like a typical developer tool:
scattered UI
docs-heavy setup
unclear feedback
So I changed one thing: the experience after signup.
Instead of sending users to documentation, I made the dashboard do the work:
→ SMTP credentials visible instantly (copy/paste, no digging)
→ Live email logs at the top (users immediately see “Delivered”)
→ Domain setup with visual SPF / DKIM / MX status (green/red)
→ One-click “Send test email”
→ Everything on a single page (no navigation friction)
The goal was simple:
Get users to their first successful email as fast as possible.
That “aha moment” is everything.
After launching this:
Activation rate increased
Support questions dropped
Paid conversions went up
No new features. Just better clarity.
Big takeaway:
Most dev tools don’t lose users because the product is bad.
They lose users in the first 2 minutes of confusion.
Curious how others approach this:
What’s the fastest way you’ve seen a product get users to value?
Just gave KingSMTP a fresh new look. The site now has a dark, premium design that we feel better represents what we do and who we serve.
For those who don't know us — KingSMTP is a transactional email delivery service running since 2017. We handle emails like sign-up confirmations, password resets, and order notifications. We accept Bitcoin and other crypto payments, no KYC required.
Would love to hear what you think: https://kingsmtp.com
We’re excited to announce that Kingmailer.co is now KingSMTP.com
While our name has changed, our commitment to providing top-notch transactional email services remains the same. With KingSMTP, you can continue to rely on fast, reliable, and secure email delivery for your business needs.
Visit us at KingSMTP.com and experience the same great service under our new name
KingSMTP.com is an SMTP service provider that focuses on delivering transactional emails. It’s designed to help businesses reliably send emails such as order confirmations, password resets, or notifications, but it’s not intended for mass email campaigns or marketing. The service ensures that critical emails reach inboxes quickly and securely, making it ideal for companies that need a dedicated and efficient email delivery system for their operational communications.
If you have a web app, and are looking for reliable SMTP, give Kingmailer a try. Free trial available. We are offering transactional SMTP services only for now, not for mass or bulk mail.
This is what we support:
✓ Sign up / registration emails
✓ Password reset emails / confirmation emails
✓ E-commerce / forum / membership site emails
✓ Email alias / forwarding, MX mail routing
We don't support:
✗ Not for Welcome emails
✗ Not for newsletters
✗ Not for mass / bulk mail
✗ Not for spamming / phishing / scamming
✗ Not for marketing / promotional / announcements emails
We have updated our pricing, here’s a breakdown:
5,000 emails /mo
$5 /mo or $49 / year
10,000 emails /mo
$9 /mo or $79 /year
20,000 emails /mo
$19 /mo or $159 /year
SMTP only transactional emails (for example e-commerce / sign up emails)
For the full pricing list:
https://kingSMTP.com/smtp-pricing-bitcoin/
Starting today we have added a new plan which will allow our clients to use our STMP service for 2 years for just only $89,=
20,000 monthly emails and max 10,000 unique recipients.
Pricing for SMTP services now:
1 month = $11.95
1 year = $59
2 yeas = $89
We offer transactional SMTP service, so not for bulk mail, but if you run a forum, membersite, ecommerce or SaaS, it's especially for that purpose.
This is now the checkout page, which I had mentioned earlier here and have implemented the feedback:
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I will be subcring to your service
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Hello, thank you for testing my product.
Keep in mind the rates we have now are different. If you finish testing the free trial, and want to upgrade, send an email to me and will give you the same rate as mentioned in this post-
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Hi Navinp my free trial is about to run out..ready to upgrade to the discounted 2yrs plan
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Hello, can you send an email to info@kingmailer.co so we can have this arranged
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Thank you navinp
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We wrote the importance of having a custom email for your business and also how you can implement this.
Now for only $29.40 /year.
This is what you get:
- Option to create multiple custom email addresses (for multiple users)
- Add more than 1 domain
- Emails send to different email addresses can be forwarded to the same inbox
- Option to add your custom email in Gmail, Proton or other email provider
- 5.000 Emails per month
Read our article:
We have updated our pricing.
We are operating in the Transactional SMTP space.
Some of the big players are Mailgun and Sendgrid.
If you compare the pricing, when paid annually:
Mailgun: $35 /mo
Sendgrid: $14.95 /mo
Kingmailer: $6.58 /mo
Try our service for free:
https://kingsmtp.com/
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Don't compete on price (or free).
White labelling and email deliverability is critical. I pay SendGrid for a dedicated IP etc.
The spam/delivered/junk webhooks are also high on the offering.
You could compete on send speed, web portal speed... lots of things here. Free isn't one of them :)
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Thank you.
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Transactional payments would be interesting (no monthly fee).
Otherwise it's yet another mailer service - just a bit cheaper.-
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Do you mean pay per " number of emails sent" ?
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Exactly. No monthly fee, but 1 email costs x cents.
It could be a niche for e.g. bootstrappers that just start out.
Helps to keep the costs down in the beginning and it would allow for an up-sell opportunity when they grow.
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Hello, can you explain what you mean?
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I checked your landing page, any reason why you can only pay in "dodgy" ways? I wouldn't trust a company with no Credit Cart payments and no company name/address.
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You’re calling Bitcoin dodgy? Okay.
Office address is mentioned on our Privacy page.
Customers can pay with Credit card or PayPal, they need to ask for this option.
The reason they have to ask and it’s not linked anymore on our homepage:
To avoid scammers for abusing our SMTP Service and doing charge backs (or the owners of the stolen credit cards doing chargebacks).
Unfortunately e-mail industry has a lot of spammers and scammers that abuse SMTP service and purchase with stolen cards. To protect our business and our existing customers who have been with us since 2017.
A single charge back can cost between 20 to 50 USD apart from the refunded payment.
To avoid all these drama I had to go this way. Hope you understand.
Customers that paid with Credit card or PayPal, can find the Manage billing link in the footer (which is handled by 2Checkout) and edit their info / subscription.
Thanks for your time and feedback.
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Thanks for the response!
You’re calling Bitcoin dodgy?
I thought that it is a known fact that crypto are mostly used for trading and illegal transactions (especially in the cases where it's the only payment method accepted, it raises a big question mark). Personally, when I think of someone requesting a BTC payment it's usually for a scam or for completing a transaction without emitting an invoice.
Office address is mentioned on our Privacy page
I checked the Privacy page but I couldn't find any company name (LLC), so this combined with the exotic payment methods made me not consider your service (as a potential customer).I wish you good luck with your project!
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Danke
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Many of us here run a SaaS business, and is using some SMTP service to have important emails delivered to users.
If you're still looking for an affordable and reliable way to do this, check out Kingmailer, try for free.
Todat we wrote a post, along with some instructions to have this setup.
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