Other than the above mentioned addons, Mumara offers certain exclusive addons. Mumara has extended the scope of PowerMTA module to a significant extent and it covers all configuration levels to well-tune PowerMTA server. Just leaving tiny tweaks for better performance, Mumara does rest of the PowerMT config automatically.
Mumara offers another exclusive feature and that is its ESP Edition. Mumara Complete Suite is currently upgradable to the ESP Edition of Mumara. It offers the ability to setup infrastructure capable of handling the workflow of complete ESP (Email Service Provider). ESP Edition of Mumara is detailed edition, covering all what is required to run the operations of an ESP. PowerMTA Configuration for this edition is different from the Product Edition.
There is other feature distinct in Mumara, like ability to setup persistent SMTP connection, or ability to send in non-persistent loop during IP warming sessions, using .htaccess configuration file for mask forwarding, CNAME domain mapping, and several other features with basic platform.
The addons Mumara develop is limited for its product Mumara only, and not compatible with any other email marketing software. Same goes for the addons 3rd party developers develop for Interspire. As being email marketing software belongs to one category, both the applications are certainly comparable, but both offer their distinct platform and hold value for their features.