Hi,
Thank you for your existence and your good services, I am your customer for about 3 decades. :)
Concerning the new rules imposed regarding the space allocated for each user (the max. 15 Gb / user rule) my idea for you is to post an instrument right in the main page of each customer's e-mail (like... in a corner of the page or in the upper part of the yahoo mail page) so that the user can monitor how much Gb he has used out of the 15 Gb limit. Could be something like a car speedometer , or something like a bar with different colours as the mail is getting stuffed up (green up to 4 or 5 Gb, yellow between 5 and 12 Gb and red 13 Gb to 15 Gb)... or something like that! :)
Ok, thanks for reading my idea.
Yes, I know that users can check their usage of their 15Gb limit but they really have to search for it in 4 to 5 steps - and it sucks. A customer should see it right in the first page , it should stick to his/her eyes like a soar thumb! :)))

Cheers & have a great day! ;)
Valeriu