Please help us help you and fill where relevant:
Your LimeSurvey version: 5.3.17
Own server or LimeSurvey hosting: Own Server
Survey theme/template:
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I want to send confirmation mail to participants for open-access survey,
from "survey administrator email address", not from "site admin email".

I got 2 ideas by Google 

1. With LimeSurvey default confirmation system, 
It doesn't work for open-access survey.

2. With QuestionID "Mail" and then "{Mail}" into "Send X admin notification email to", 
It works but the mail sent from "site admin email".

Both of them don't satisfy my requirement.

I wish there were "Sender" selectors in Email template screen thougn only on "X admin notification" tab,
with options "site admin email" or "survey admin email" or Questions (response).

Please, think about.
Thank you.

Hi,
you asked this already in the other section.

@holch advised to file a feature request.
This is done here (logon with the same credentials as here in the forum)
[url] community.limesurvey.org/bug-tracker/ [/url]
Select "feature request"
 

Thank you, Joffm.
And I'm sorry that was not along with the rule here, to everyone.

Joffm,
could you tell me, so I should write to "Feature requests" by myself?
I get a little nervous to write to anywhere else...

Thank you.

Yes, you should write it It is your request.
You see a very simle form (here the German GUI, but you see the structure) 

Nothing to be nervous about. It is just like writing in the forum, just a little more "structured". You describe what the idea is and how it should work. and then you wait, and wait and wait...

Please don't get your hopes up too high that this will be implemented quickly though.

But did you have a look at the plugin I mentioned?

gitlab.com/SondagesPro/mailing/smtpByUser

Allow to set and use smtp parameters by user.

To me, the description of this plugin sounds pretty much exactly like what you are trying to do. User in this case being the survey admin.

holch wrote:

But did you have a look at the plugin I mentioned?

gitlab.com/SondagesPro/mailing/smtpByUser

Allow to set and use smtp parameters by user.

To me, the description of this plugin sounds pretty much exactly like what you are trying to do. User in this case being the survey admin.
 

Yes,
Need to be updated/rewritted for 5.X .

You can still create a feature request, but it's more quick to create a plugin for 5X , even (for example) usage of exprtession for the sender adress and name.