Follow along with the video below to see how to install our site as a web app on your home screen.
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I dont know if you can disable the page, but you can disable webmail on a per domain basis. It can be found in the domain under mail > mail preferences.
Edit: Also, you can remove the DNS record for "webmail" in that domain. That will prevent anyone from seeing a horde login page. (apache redirects urls starting with webmail.* to the horde login)