Anyone familiar with UserEngage

Looking to migrate from mailgun. Mostly because mailgun is too barebones for someone like me that is entirely solo. If no one has experience with them then I would appreciate someone knowledgeable with Discourse mail connectivity to assist me. If you need compensation let me know what you need to make this worth your time.

UserEngage Funderbeam Profile
https://www.funderbeam.com/startups/userengage
Funderbeam is a primary and secondary market for early-stage startup investments providing easy delivery and access to growth capital.

UserEngage

UserEngage Documentaton