When comparing Mailgun vs EmailSuccess, the Slant community recommends Mailgun for most people. In the question“What are the best transactional email services?” Mailgun is ranked 1st while EmailSuccess is ranked 13th. The most important reason people chose Mailgun is:
Mailgun is included and configured by default in Meteor.js. So for projects which are built using Meteor, it's very easy to integrate Mailgun.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Integrates by default with Meteor.js
Mailgun is included and configured by default in Meteor.js. So for projects which are built using Meteor, it's very easy to integrate Mailgun.
Pro Developer-focused
Mailgun has a RESTful API with libraries and code examples in curl, Ruby, Python, PHP, Java, C#, Go.
Pro Management
Pro Authentication
Pro Bounce processing
Pro High performance
Cons
Con Sub-par support
It has been reported several times that Mailgun's support is not excellent. Most of the time, they require a lot of time to respond to questions or support queries.