Widely used and highly scalable email service for flexibility.

Amazon SES is a very cost-effective and popular option when it comes to transactional emails. It is designed for digital marketers, application developers, and businesses of all sizes.

You can either utilize their SMTP interface or integrate it into one of your applications with the help of AWS SDKs. Apart from that, you can literally borrow its email sending capabilities and run them into the software you already use.

You can enjoy features like content filtering, dedicated IP addresses, and a dashboard to enhance the sender’s reputation. You’re also allowed to put certain rules using configuration sets for the emails you send and get a detailed analysis of your overall email marketing performance.

Whether you wish to send transactional emails, promotional emails or entirely build a multi-tenant solution for your customers, Amazon SES is great for all of that. Their customer portfolio is full of big companies like HBO, Vodafone, and Allergan, so you can hardly go wrong with them.

The great thing is, they allow a “pay as you go” pricing option so you only have to pay for what you use. No upfront fees or fixed expenses, just complete flexibility.

An email solution that is transparent, reliable, and made with developers in mind.

With global infrastructure and powerful APIs, Mailgun allows you to send, receive and track emails in the most appropriate manner while being simple in nature. It’s totally reliable when you need it the most, and delivers a 99.99% uptime SLA.

Their easy SMTP integration and the use of RESTful API take away the pain of sending transactional emails. And the great thing is, you can scale up super quick no matter what the amount of emails you wish to send.

You can also easily validate emails and filter out the bad ones, helping you focus on legitimacy. Talking about deliverability, irrespective of whether you send a high amount of emails or low, your emails are going to get delivered seamlessly, all thanks to their experts.

Mailgun has robust APIs but the setup and ease of use are crazily convenient. On top of that, their comprehensive documentation makes it even better. Just activate your account, set up your domain name, and start sending emails.

It has various programming language options, such as Python, PHP, Java, and Rails.