Use URL instead of domain to suggest log ins?

Hey

I have a webspace at say:
https://abc.gjk2.hosting

and the webmail URL is

https://abc.gjk2.hosting/webmail

now all my webmail log ins show when I log into my webspace and my webspace log in shows up when I log in my webmail. I tried all options regarding the domain, but none of them can avoid this behavior. 

Is there a way at all?

Thanks

Rolf