No, Google hasn’t entered into a relationship with any third party email client, but what they have done is pretty cool.
Google is offering Yahoo and Hotmail/Outlook users the opportunity to Gmailify their accounts. What this means is that Google wants the heathens to have a taste of what Gmails users enjoy including Google Now cards, spam protection, and inbox organization.
To get started, you need to enable the Gmailify feature by opening the Android app, touch the menu icon, click Settings, tap the non-Gmail account you’d like to link, and then link the account.
That is it, my dear Yahoo and Hotmail brothers and sisters, your very chance to enjoy the good life.
Update: edited the title