When comparing Yandex Mail vs Yahoo! Mail, the Slant community recommends Yandex Mail for most people. In the question“What are the best online webmail services?” Yandex Mail is ranked 7th while Yahoo! Mail is ranked 8th. The most important reason people chose Yandex Mail is:
User accounts outside Russia have their data held on EU servers, compliant with GDPR.
Specs
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Pros
Pro Data hosted in EU
User accounts outside Russia have their data held on EU servers, compliant with GDPR.
Pro Unlimited storage
There us no limit on the size of mailboxes.
Pro Free Domain Hosting
You can host up to 1000 email addresses at your own domain free of charge, with unlimited aliases.
Pro Unlimited storage
There us no limit on the size of mailboxes.
Pro Tabs
With this Yahoo! Mail feature users can open any e-mail in a new tab and get back to the mail list without having to close the e-mail that the user is currently reading.
Pro Background wallpaper
Similar to Mail app bundled in Windows 10, Yahoo! Mail allows users to set images from Flickr as the background image for the app.
Pro Stationary
Stationary is an add-on that's only available in Yahoo! Mail. It allows users to customize and enhance the look of the email. Things like image borders, letter style etc. can be changed before sending the email to intended recipients.
Cons
Con Agressive spam filter
No control over the level of spam filtering, which discards many messages before they reach the inbox.
Con Connections to Russia
"Yandex N.V. is a Russian multinational corporation specializing in Internet-related products and services, including search and information services, eCommerce, transportation, navigation, mobile applications, and online advertising. Yandex provides over 70 services in total." (https://en.wikipedia.org/wiki/Yandex)