This is prob asked a lot but I can find is this post but its from 2012 so not sure if it would still work?
My notices to the users when they signup/register use the name & email in the network settings.
When the admin gets the "New Site Registration" email or the notice when a user requests a password change the notices always come from "wordpress <firstname.lastname@example.org"
Subject: New Site Registration: http://mydomain.com/username
From: "WordPress" <wordpress@mydomaincom>
How can I change that so it matched the email for the websites admin?
Will that post above still apply?
I have a newsletter plugin that lets the user specify the "reply to" name & email and just wanted to be sure the function I add doesn't override those.