Bare-bones but super reliable and easy to use.

I use several different email service providers, each for a different reason. I use Mailgun almost exclusively for inbound mail processing. The inbound processing also offers a preliminary spam filter so that at least most of the spam isn't sent further down my process chain. It's super easy to set up inbound routes using specific strings or wildcard matches that will accept mail and forward to multiple different recipients. These recipients can be either proper email addresses or webhook endpoints. I often use the address forwarders in combination with the SMTP outbound service to build a system where Gmail users can use their free gmail.com account to receive and send emails from their small business domain without having to sign up for and configure a proper G Suite account. I use the webhook forwarders in combination with Zapier and Integromat to receive any emails that need to be processed and automatically acted on. Mailgun normalizes all the different types of email and attachment encodings and packages the message data into an easy-to-parse JSON package that makes it super easy for me to grab what I need and reliably act on the normalized data.

Pros

Inbound mail processing with spam filter Free tier offers great sending limit SMTP and API integration for outbound messaging

Cons

This product doesn't offer any sort of backend mail building or sending functionality. It's only an engine for sending messages. This means you'll have to build your messages somewhere else and integrate them into your sending code.

Incredible Deliverability, Clean Platform, Success with MailGun!

Super pleasant, great chat support, fast email support replies, always quick to help and communicate.

Pros

Clean UXI for navigating the system, simple set up, clear dashboard to find issues quickly and navigate around the site. Ability to clean database lists to minimize bounce. However, the BEST part is they are free up to 10,000 emails a month, which is a ton! So to give the full custom power of connecting your domain and sending out, that's a huge value. I will get over that limit and upgrade soon, but that is an incredible way to start a relationship. Almost a year of free service to use their system versus my server.

Cons

I actually have not found anything that I do not like. Many will complain about high bounce rates or going into spam. I find that issue arrises on multiple factors outside of mailgun control, such as the receiving server, and the mail habits of the person opening it, do they get a bunch of spammy mail already? And was the mail piece written in a poor nature, this increases spam folder direction, however, they do have dedicated IP service for those wanting to mitigate one area of cause for spam direction. Again, never been my experience.

Feature rich, strong support team

Overall, a very good experience. Mailgun was definitely a very competent software and tool for dealing with the complex nature of sending out mass marketing emails successfully.

Pros

In my previous work as Director of Operations of a medical software company, I worked with the development team to implement and utilize the software. A lot of the technical side of things was over my head, but the mailgun support team was top notch and integral to us executing on a successful deployment of automated emails at a scale far greater than anything we had tackled before.

Cons

Most of my gripes are simply due to lack of understanding - a lot of the software was quite technical in nature and over my head. But I can't really speak in detail to any pros/cons of directly interacting with the software or its user interface.

Good, but crap customer service

They suddenly and mistakely suspended one of my domain and took ages to get it back. They told me that their back-end service sometomes does it by mistake... not sure why it took them days and days to reply, and still not resolved after almost a week... (I was using a mid-range package, so not the the free tier.)

Pros

Easy to setup and use in WHM Clean and userful dashboard

Cons

Customer service is slow and useless More expensive compare to others

Mailgun is awesome

Pros

Easy to deploy, they even have an iOS SDK. I use it to deliver automated emails for my app (welcome emails, password reset, announcements, etc).

Cons

There are currently no cons for me with this software.