How to embed Yandex Mail and Google Mail on your website?

Question

Email

It is necessary to insert a certain frame into the site block, which will allow you to write, read and send letters after authorization in Yandex Mail or Google Mail.
More or less like this:

Answer 1

And what is the purpose of this undertaking?
Get mail on your domain? There it is there and there it is out of the box. (on gmail you can also do it through postfix)
And so, you need to look towards their API and there it already depends on your imagination.
You can also do this:
set up duplication / forwarding to your gmail box and display this mail
Set up your smtp server and change the server in gmail from theirs to yours (it seems like this is also possible)