What's the difference? And are you just trying to hide or something else?

Apparently their ISP doesn't like Google, which confuses me, seeing as Google is basically an internet "need" at this point and I think any ISP would be foolish to interfere with the operations. I'd probably suggest having a look at the router settings.

yandex is better than gmail for mail.

it allows free email aliases, much less ads and tracking.

I presume the normal "web mails" (like outlook.com, gmail.com etc.) work fine with email clients like Thunderbird Mail and such.

I have more than one email account in hotmail.com/live.com/outlook.com (for historical reasons), and I can have them all in Thunderbird, ie. I just run Thunderbird and I have instantly access to all the different email accounts. At the same time, I am also able to read the emails with web browsers, in case I need to access email from some other PC where I don't have Thunderbird set up.