Full day and date in tooltip in inbox
I really, really liked in the old Yahoo Mail how you could "hover" your mouse over the date in the far right column ... and a "tooltip" would show up showing you the "full day and date" ...
For example, the inbox could show "May 29" ... but if you moused over the May 29 ... you would get a tooltip showing you something like, "Wednesday, May 29, 2019" ...
That was S-O-O useful ! ... A lot of times I want to see what "day of the week" that date is without having to freaking bring up a calendar ... sigh ...
The new Yahoo Mail does NOT have that really cool functionality! Instead ... all that happens when you mouse over the date is ... you get a "delete message" icon ...
Bring back the ability to see the "full day and date" tooltip when we hover over an e-mail in the inbox! Or give us an option to bring that back!

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Alan Feldman commented
And the same goes for when you're looking at the e-mail itself ... Hovering over the "date" doesn't bring up the tooltip showing you the full "date and time".
In other words if it says "May 29" ... hovering over the date no longer shows a tooltip saying "Wedesday, May 29, 2019".
So this functionality should be brought back for both e-mails in the inbox view "and" if you're looking at the e-mail itself.