Just a simple list with best and lesser known (unknown) Sendgrid alternatives, active today in the Transactional SMTP or SMTP (includes email marketing) space.
Price /mo
Emails /mo
1
Mailjet
$15
15,000
2
Postmark
$10
10,000
3
Kingmailer
$5
5,000
4
Pepipost
$25
150,000
5
Mandrill
$25
25,000
6
Sparkpost
$20
50.000
7
SendinBlue
$25
10,000
8
Mailgun
$35
50,000
9
SendPulse
$59.88
100,000
10
Routee
$304.9
30,000
11
SMTP2Go
$10
10,000
Seen an error? Or have a suggestion? Leave a comment.
For this list we have used Slant and Capterra.
We wanted to present our users a list with best and lesser known Sendgrid alternatives.
We offer reliable and very affordable SMTP email service which is dedicated to transactional emails, the type emails that ae usually generated by SaaS services, think of registration emails, password reset emails and other important notifications that are generated by your SaaS app.
The SMTP service comes with a clean high reputation IP-address, which will help you in landing your important sign up emails in users’ inbox. Try it for free.
This article is related to the following queries:
smtp for password reset
smtp for saas
smtp for transactional emails
smtp for registration emails
SMTP for SaaS
In order to setup one time password, follow the steps in below.
First of all…
Our SMTP is solely dedicated to transactional emails and emails like password reset emails
We accept Doge / Dogecoin. Buy your SMTP Server and pay with Doge / Dogecoin. Try our SMTP service for free. Start sending, receiving and route /forward emails with your SMTP username and password. Pay with Doge / Dogecoin to upgrade your account.
You can deposit the payment directly to our wallet address. 20,000 emails per month. 5,000 monthly unique recipients. For Routing & Transactional emails only. Change the quantity to purchase additional months. Not for sending mass mail or newsletters. Have questions? Send us an email info@kingmailer.co. We accept Bitcoin, Ethereum, Dogecoin, PayPal and all major cards.
You can deposit directly to our wallet address:
D9TEVftQ7wFWdP5UGBas1xWsSNSa8XgSiV
Benefits and features
Price per year
$49
Crypto Payments
Yes
Inbox rate %
99%
Transactional Emails Focus
Yes
Bulk / Mass Emailing
No
API included
Yes
MX Routing
Yes
DKIM & SPF Support
Yes
Setup Time
2 minutes
Free Trial
Yes
Customer Support
Email & Telegram
WordPress Plugin
Yes, available
Privacy Focused
Yes
Easy to troubleshoot emails
In your KingSMTP dashboard, you can click on each email to troubleshoot. KingSMTP logs and retains data of your emails, this is very useful when you need to troubleshoot your emails.
Here are a few screenshots to give you an idea:
Incoming messages
Spam check
Spam status
Extra details of your message
Spam Check details
Spam score
This is already pre-configured in your account, give it a try.
How does it work?
After signing up with Kingmailer you will have your own SMTP mail server, with SMTP username and password / Email API. You can use your new SMTP server and integrate with your web apps for example WordPress, Magento or iOS/Android apps.
The SMTP server is tied to your domain, make sure to add your domain first and verify its ownership by adding the SPF and DKIM records (this will be provided to you in your account).
Once you have added/verified your domain, enter the following into your SMTP configuration to start sending transactional emails:
Host: kingmailer.org
Type of encryption: TLS
SMTP Port: 587, 465, 25 or 2525
SMTP Authentication: Yes
SMTP username and password
After following these steps, all of your transactional emails will be relayed via Kingmailer and delivered to your customers inbox.
Have questions?
What payment methods do you accept?
We accept Bitcoin, Ethereum, Dogecoin, PayPal and all major credit and debit cards. Your payment information is stored and processed securely by 2Checkout and never reaches our servers.
Can I buy Transactional SMTP here?
Yes.
Can I use this SMTP service for sending mass / bulk mail?
No, we do not offer our service for sending mass / bulk mail.
Do you accept Bitcoin, Ethereum or Dogecoin?
Yes.
Will I have my own SMTP username and password?
Yes, after signing up, verifying your domain, your own SMTP username and password will be ready for you to use. All of your emails will be logged and easily viewed in your own email dashboard. You will also have your own Email API.
Can I use this with a WordPress SMTP plugin?
Yes. We also have our own WordPress plugin, just search Kingmailer SMTP in the WordPress directory. It works with our HTTP API.
Do I need to have a domain for this?
Yes. In order to be able to use our SMTP service, you will need to have your own domain. You will need to verify the domain and add a few DNS records (at least SPF and DKIM), before it’s good to go.
Do you offer forever free trials?
No. You can try the service for 14 days. No credit card required.
Can I ask for a refund?
Yes, no problem.
Will my emails go to the spam/junk folder?
We have a 99% inbox rate.
Can I send/receive emails in my email address?
Yes, this is possible. You will need to add our MX records to your DNS and configure routing. Don’t worry, we’ll help you with this.
Can I upload my list here and start emailing?
No. We do not provide a way for customers to upload their subscribers onto our platform.
If you are here, than ou are probably already familiar with one-time password emails (OTP). Our SMTP service is dedicated with transactional emails/application emails, such as “password reset” emails, and other e-commerce emails.
This makes our SMTP service perfect for one-time password emails (OTP). The SMTP service comes with a clean high reputation IP-address, which will help you in landing your important OTP emails in users’ inbox. Try it for free.
This article is related to the following queries:
one time password
one time password link
otp code
one time password smtp
One Time Password
In order to setup one time password, follow the steps in below.
First of all…
Our SMTP is solely dedicated to transactional emails and emails like OTP password reset emails
We accept Ethereum. Buy your SMTP Server and pay with Ethereum. Try our SMTP service for free. Start sending, receiving and route /forward emails with your SMTP username and password. Pay with Ethereum to upgrade your account.
For Routing & Transactional emails only. Change the quantity to purchase additional months. Not for sending mass mail or newsletters. Have questions? Send us an email support@kingmailer.co. We accept Bitcoin, USDT, Binance Pay, Credit cards and PayPal payments.
Easy to troubleshoot emails
In your KingSMTP dashboard, you can click on each email to troubleshoot. KingSMTP logs and retains data of your emails, this is very useful when you need to troubleshoot your emails.
Here are a few screenshots to give you an idea:
Incoming messages
Spam check
Spam status
Extra details of your message
Spam Check details
Spam score
This is already pre-configured in your account, give it a try.
How does it work?
After signing up with Kingmailer you will have your own SMTP mail server, with SMTP username and password / Email API. You can use your new SMTP server and integrate with your web apps for example WordPress, Magento or iOS/Android apps.
The SMTP server is tied to your domain, make sure to add your domain first and verify its ownership by adding the SPF and DKIM records (this will be provided to you in your account).
Once you have added/verified your domain, enter the following into your SMTP configuration to start sending transactional emails:
Host: kingmailer.org
Type of encryption: TLS
SMTP Port: 587, 465, 25 or 2525
SMTP Authentication: Yes
SMTP username and password
After following these steps, all of your transactional emails will be relayed via Kingmailer and delivered to your customers inbox.
Have questions?
What payment methods do you accept?
We accept Bitcoin, Ethereum, Dogecoin, PayPal and all major credit and debit cards. Your payment information is stored and processed securely by 2Checkout and never reaches our servers.
Can I buy Transactional SMTP here?
Yes.
Can I use this SMTP service for sending mass / bulk mail?
No, we do not offer our service for sending mass / bulk mail.
Do you accept Bitcoin, Ethereum or Dogecoin?
Yes.
Will I have my own SMTP username and password?
Yes, after signing up, verifying your domain, your own SMTP username and password will be ready for you to use. All of your emails will be logged and easily viewed in your own email dashboard. You will also have your own Email API.
Can I use this with a WordPress SMTP plugin?
Yes. We also have our own WordPress plugin, just search Kingmailer SMTP in the WordPress directory. It works with our HTTP API.
Do I need to have a domain for this?
Yes. In order to be able to use our SMTP service, you will need to have your own domain. You will need to verify the domain and add a few DNS records (at least SPF and DKIM), before it’s good to go.
Do you offer forever free trials?
No. You can try the service for 14 days. No credit card required.
Can I ask for a refund?
Yes, no problem.
Will my emails go to the spam/junk folder?
We have a 99% inbox rate.
Can I send/receive emails in my email address?
Yes, this is possible. You will need to add our MX records to your DNS and configure routing. Don’t worry, we’ll help you with this.
Can I upload my list here and start emailing?
No. We do not provide a way for customers to upload their subscribers onto our platform.
Common problem in WordPress, emails not being sent, not even password reset emails. Often this happens because port 25 is blocked by your hosting company, or due to some configuration problem, or DNS problem…
Luckily we have a solution for this, as we ourselves have faced this exact issue before and have solved it.
In order to fix your email delivery, follow the steps in below.
First of all…
You will need an SMTP plugin, like Kingmailer SMTP WordPress and you will need an SMTP service like Kingmailer
Emails per month. For Routing emails only. Have questions? Email us info@kingmailer.co. We accept Bitcoin, PayPal and all major cards. Thank you for supporting small business.
Easy to troubleshoot emails
In your KingSMTP dashboard, you can click on each email to troubleshoot. KingSMTP logs and retains data of your emails, this is very useful when you need to troubleshoot your emails.
Here are a few screenshots to give you an idea:
Incoming messages
Spam check
Spam status
Extra details of your message
Spam Check details
Spam score
This is already pre-configured in your account, give it a try.
For example you have 5 domains, but you want to manage 1 email inbox. You want to send and receive emails from a single email inbox.
This is the way to go. To illustrate this…
These are the fictive email addresses you have from the 5 different domains:
info@FirstDomain
name@FirstDomain
info@SecondDomain
name@SecondDomain
info@ThirdDomain
name@ThirdDomain
Etc
Your project domains.
Below is the email address that you want to use:
John@Gmail.com
Your Gmail address that you use daily.
So in your Kingmailer-account, you can create MX Email Routing / Forwarding, and have this setup, so all emails send to different recipients, all get delivered to your primary email inbox.
We have a step-by-step guide on how to setup MX email routing using your own domain.
We will assume you have already signed up for a free Kingmailer account, and have already setup your domain. (SPF, DKIM, MX and RETURN PATH)
First thing after adding/verifying your domain in your account is, to create Endpoints.
Follow the steps below to create an Endpoint, from Step 4 we explain how to send emails from Gmail, so not just to forward emails:
Here’s how to get started. If you need help, just send us an email info@kingmailer.co:
Create Endpoints
An Endpoint is where you want the emails to be delivered, it can be your Gmail-address. In your Kingmailer-account go to Routing (1), click on Address Endpoints (2) and then on Add your first address endpoint (3).
Enter your email address
Enter your email address (1) and click Create address endpoint (2).
Create a Route
The Endpoint is there, so now you can create any email address you like, all emails send to this address will be delivered (forwarded/routed) to the Endpoint aka your Gmail address.
Enter a username (1) for your email address for example info@domain so there you’ll enter just info. Select the domain (2) (which you already verified in your account: SPF, DKIM, MX and Return Path). Choose the Endpoint (3) which you created earlier.
Sending Emails from Gmail
Go to Settings > Accounts and Import > Add another email address > Send mail as
Add your email address
Enter your name and your email address, allow Treat as an alias and then Next Step
Enter the SMTP credentials
You can use these settings:
SMTP Server: kingmailer.org Username: enter your SMTP username Password: enter your SMTP password Port: 587, 465, 25 or 2525 Secure connection: TLS
These are all the steps needed to start MX email routing emails.
You can create multiple addresses and have the emails MX routed to your email inbox.
In this tutorial we have worked with Gmail, but you can use any other provider such as Hotmail, Yahoo or Proton etc to setup MX email routing. You can add unlimited number of addresses.
Have emails send to your business domain delivered (routed) to your existing email inbox. This can be your Gmail, Proton, Outlook or Yahoo email address (or any other email provider).
For example Jane sends an email to Peter@Example.com, but you want this email to be delivered to your email inbox at Peter@Gmail.com
You can buy Inbound email routing for only $29.40 per year.
Emails per month. For Routing emails only. Have questions? Email us info@kingmailer.co. We accept Bitcoin, PayPal and all major cards. Thank you for supporting small business.
We have a step-by-step guide on how to setup inbound email routing using your own domain.
We will assume you have already signed up for a free Kingmailer account, and have already setup your domain. (SPF, DKIM, MX and RETURN PATH)
First thing after adding/verifying your domain in your account is, to create Endpoints.
Follow the steps below to create an Endpoint, from Step 4 we explain how to send emails from Gmail, so not just to forward emails:
Here’s how to get started. If you need help, just send us an email info@kingmailer.co:
Create Endpoints
An Endpoint is where you want the emails to be delivered, it can be your Gmail-address. In your Kingmailer-account go to Routing (1), click on Address Endpoints (2) and then on Add your first address endpoint (3).
Enter your email address
Enter your email address (1) and click Create address endpoint (2).
Create a Route
The Endpoint is there, so now you can create any email address you like, all emails send to this address will be delivered (forwarded/routed) to the Endpoint aka your Gmail address.
Enter a username (1) for your email address for example info@domain so there you’ll enter just info. Select the domain (2) (which you already verified in your account: SPF, DKIM, MX and Return Path). Choose the Endpoint (3) which you created earlier.
Sending Emails from Gmail
Go to Settings > Accounts and Import > Add another email address > Send mail as
Add your email address
Enter your name and your email address, allow Treat as an alias and then Next Step
Enter the SMTP credentials
You can use these settings:
SMTP Server: kingmailer.org Username: enter your SMTP username Password: enter your SMTP password Port: 587, 465, 25 or 2525 Secure connection: TLS
These are all the steps needed to start routing inbound emails.
You can create multiple addresses and have the emails routed to a your email inbox.
In this tutorial we have worked with Gmail, but you can use any other provider such as Hotmail, Yahoo or Proton etc. You can add unlimited number of addresses.
Send important transactional emails like password resets, order confirmations, and more with a reliable SMTP service. Avoid the hassle of maintaining your own email infrastructure while ensuring timely delivery of your emails.
Sending a few emails a day is generally manageable, even if you’re reaching dozens of people. Services like Google’s Gmail limit email sends to 500 per day, and many shared hosting providers also impose email caps. While this might be fine for personal use, sending hundreds or thousands of transactional emails daily can easily exceed those limits. For businesses sending bulk emails or transactional messages to large audiences, cloud-based SMTP services provide the necessary scalability. With services like KingSMTP, you can send transactional emails to any number of customers, triggered by their actions on your site, all without managing your own SMTP server. KingSMTP offers seamless setup and integration for your transactional email needs.
Email servers vs. cloud-based SMTP services
While managing your own email server is an option, sending large volumes of emails—whether transactional or promotional—can be technically demanding. Managing email servers at scale can consume valuable developer time and require significant resources to handle email traffic. Many companies, even those that run their own email servers, often choose to rely on a dedicated SMTP service for transactional emails. The ease, speed, and reliability of using a service like KingSMTP make it an attractive alternative. KingSMTP offers a ready-to-go SMTP relay and a customizable email API for developers seeking more control over email delivery.
Ensuring reliable delivery
Sending emails is only half the battle—ensuring they’re actually received is just as important. Without strong deliverability and tracking mechanisms, it’s difficult to know how many of your emails will bypass spam filters or avoid bouncing. Testing your own servers might help, but it can be time-consuming and may not provide all the insights you need. A robust email service should not only help you scale your transactional messages but also ensure high deliverability rates. KingSMTP enhances deliverability with domain name authentication and email address validation, reducing bounce rates and preventing spam complaints. For companies requiring the highest delivery success rates, KingSMTP’s managed service provides personalized support and proactive monitoring to optimize performance.
Maximizing the impact of transactional messages
Great email marketing feels personal and relevant. Transactional emails—whether they’re password resets, order confirmations, or account updates—can be a key part of your marketing strategy. Tailored, responsive, and relevant transactional messages can help increase customer engagement. With KingSMTP, you can take your transactional emails to the next level by conducting A/B tests and analyzing key events like click-throughs. The platform’s real-time analytics, including open and click tracking, allow you to continually optimize the performance and effectiveness of every email you send.
Start using our transactional SMTP service
Explore our free plan to optimize your email delivery rates with one of the top SMTP solutions available. Discover our plans with bundled features for enhanced deliverability, perfect for businesses needing reliable SMTP service.
