Mailgun lets small startups and SMBs with getting their transactional email system off the ground. Mailgun takes emails received over API and then sends them out to your users.
It's pretty cheap relative to other products out there like Sendgrid. There's a lot some decent logging that gets outputted for non-engineering marketers to look at to see what's going on. Pricing scales up with you so as you grow you pay a bit more but again pricing isn't so bad. Getting started is also fairly easy because there's a lot of documentations.
Shared IP address accounts will have a hard time sending to Hotmail or Microsoft Outlook emails. For whatever reason Microsoft and Hotmail flag Mailgun IP addresses as more spammy. Also, this is probably a higher-coding email provider compared to tools like Mailchimp. But, given the price, I'm a big fan of Mailgun to get started if you're coding a side project and need transactional emails to go out.
|You type:||You see:|
|* List 1 |
* List 2
* List 3
|### Smaller Header|