When comparing CauseOs vs Mailgun, the Slant community recommends Mailgun for most people. In the question“What are the best services for sending newsletter/marketing emails?” Mailgun is ranked 6th while CauseOs is ranked 12th. 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 Cheaper than mailchimp
Pro Great support
These guys will do anything for your organization.
Pro Detailed analytics
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.
Cons
Con Startup
The company is in early stages of development.
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.