Email List Verification
Quickly verify your email list to eliminate bounces. Improve campaign performance and inbox placement. Drag and drop your list into our interface or import directly from your ESP.

Integrations
Kickbox works with your favorite ESPs and marketing tools. No matter your workflow, we have an integration to help you eliminate invalid and fake email addresses. Connect Kickbox with your favorite tool and start verifying.

Real-time Email Verification API
Prevent fake and mistyped email addresses within your application in real-time using our API. Get a head start with the Kickbox API libraries for Node.js, PHP, Python, and Ruby.

Test Drive Our Email Verification API
Select an email address to generate working code and see a simulated verification result.

The Kickbox Advantage
See why companies are leaving their legacy tools behind for Kickbox’s all-in-one email solution

Kingmailer is a simple and fully featured mail server / SMTP service build for anyone, not just developers. Think Sendgrid, Mailgun or Postmark, but much more easier to use and with 98% inbox delivery. Start sending, receiving or routing emails with a few clicks.

Kingmailer is for people who want a mail server / SMTP service to be simple and not bloated with options. Every month, thousands of emails are sent, received, routed using our delightful and powerful SMTP service. Try for free.
Give Kingmailer a try

Kingmailer
Kingmailer provides everything you’ll need for sending, receiving and routing (forwarding) your emails.

Sending
Inbound
Analytics
Security
Reliability
Transactional Emails
Bulk/Marketing allowed ✘
SMTP
REST API
Official libraries
Community libraries ✘
Spam score checking
Spam complaint handling
Bounce handling
Shared IPs
Dedicated IPs
Separate servers
Pre-made email templates ✘
Template engine ✘
Inbox preview
Scheduled delivery ✘
A/B testing ✘
Email address validation ✘

Built for developers
We build everything API first with a focus on simplicity and compliance to standards.

Engineered for reliability
We’re serious about our 99.99% uptime SLA, and we’ve got the track record to prove it.

Prepared for questions
Help is here when you need it with free 24/7/365 support for all customers. You’ll feel the love.

Bring your ideas to life and deliver great campaigns with Mailjet
Create stunning emails in minutes with Mailjet’s best-in-class email builder. Easy to use email marketing features like segmentation, pesonaization, and a/b testing help you land right in the inbox and engage the reader. Try Mailjet today for free.

Powerful sending infrastructure
Easy SMTP integration and a simple, RESTful API abstracts away the messy details of sending transactional or bulk email. Scale quickly, whether you need to send 10 or 10 million emails.

Fast, accurate email validation
Know exactly who you should (and shouldn’t) send to. Integrate our real-time email validation API to protect your web forms or drag and drop your contact list to quickly weed out bad emails.

Managed email delivery for high volume senders
Sending millions of emails a month requires an extra level of diligence to achieve and maintain optimal deliverability and performance. Our experts help you get more emails delivered, with a strategy customized to your needs.

Send an email with a few lines of code
Let’s send your first email. Grab the code below in your preferred language and paste it into your terminal.

Fast setup, easy integration
Get up and running today. We have a robust set of APIs and comprehensive documentation so you can spend less time adding email into your app and more time building cool stuff. Here’s what needs to get done:
1
Activate your account
After you sign up, check your email, click a link, and you’re done.

2
Set up your domain name
Add a couple DNS records so we know you own the domain you claim to be sending emails from.

3
Start sending
Deploy the code wherever email fits into your app or plug your SMTP credentials into a tool of your choice.

Full endpoint documentation
Our API reference includes code samples in your favorite language or framework.

Email API for application-driven emails
Send transactional or bulk email effortlessly with our SMTP relay and flexible HTTP API.

Developers and product teams love using Mailgun to communicate with their users
Based on real customer reviews, G2 Crowd named us the #1 transactional email software. Learn how our customers achieved a 1350% increase in sending speed, 817% increase in unique click rate, and other great results.