Yahoo says the Mail App that came with my Nokia Lumia 720 is not secure enough, that I should get the most secure Mobile Mail App from Google App Store
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1That would be odd advice, as apps in the Google App Store will not work on Windows Phones, where are you seeing this warning? – Rowland Shaw♦ Oct 10 '16 at 14:47
https://security.stackexchange.com/a/96841/101624
As stated in a previous question about the security of the Mail app, the app is only secure if you are using a secure mail server. The message given to you from Yahoo might be entailing that windows phones cannot use secure protocols for sending emails. The mail app is secure as I have been using it for 5 years and have had no security issues. The Mail app on Windows phone does use SMTP(Simple Mail Transfer Protocol).
