Open email app url

I want to add link to my website "Check your email". If user is on mob version link should open mail app or email service url in browser if app is absent. For example user has test@gmail.com. Link should open gmail app or https://mail.google.com in browser if user has no gmail app. Maybe it's better to launch user preferred mail app instead of gmail.

Android

I found http://ift.tt/1qeNcA5 whith intent link intent://scan/#Intent;scheme=zxing;package=com.google.zxing.client.android;S.browser_fallback_url=http%3A%2F%2Fzxing.org;end

It works fine but I can't understand how to do same thing with http://ift.tt/1KN1OHl or any other app

Also I found http://ift.tt/QBXKy1 to open mail app but intent://send#Intent;action=android.intent.action.SEND;end not works

Can anybody give me working url to open gmail app or default mail app?

iOs

Universal links http://ift.tt/2v59baT

Internet has many articles how to link your site with your app. But how can I start another app from my site?