How to create a variable/parameter that can be both retrieve

Problem statement:

We setup a SMTP with our email, eg: support@mycompany.com.

This email,

1) is hardcoded in C# when sending out registration email.

2) is hardcoded in cshtml for display purposes

3) is hardcoded in "Sitefinity -> Adminstrators -> ... -> Labels and Messages" (forgotPassword Email template)

Now, when there is a change in the email, developers have to search the entire project + sitefinity to replace this string.

Question: is there a way to set this value at sitefinity, such that it can be both retrieved from "labels and messages" (eg: ConfirmationUrl) and c# backend?