I'm trying to describe feedback from a software system. I believe if the application's emails seems like they are from a person rather than an automated message it will get a better response from the user. When talking and writing about this I need a more formal word for this idea.
In an example sentence
The [word] of the feedback makes a difference in user's response.
I originally thought locus. When I read definitions of it though, I don't think it's the right thing, but close.
Note: this isn't spam mail, it's analytics reporting to users identifying issues in their comprehension of topics to promote help-seeking remediation. I don't need information about how spam bots are dumb and ineffective.