You can send your email from the server. For example: you can create a microflow that sends an email and call it from a nanoflow in the native app. 

Yes, I was doing that, but my problem was that I can't pass a persitable entity attribute to a microflow from nanoflow.

I've solved creating an auxiliar non-persistable entity to pass the attributes that I need to my microflow and it works.

Thanks anyway!