Append variables to Redirect URL

Hi,

I need to append a variable (email address) to the login redirection. For example, redirect to http://www.mydomain.com/something/?email=me@here.com

I found another topic that seems kinda similar: https://wordpress.org/support/topic/append-arguments-to-the-url/

But I am not sure the suggestion fits. Can you please advice if I can have variables in the URL or even how I could hack something in?

Regards