Here's my post from the thread on this topic in Community Chat:
There are numerous reports on the internet.
This notice was just posted on AOL Customer Support's official Twitter account:
"Some customers are reporting an issue with logging into Yahoo and AOL due to a server error. We are aware and working to get this resolved as soon as possible. Thank you for your patience!"
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As a side note:
When you think your mail provider or a website is out of service -- you get error messages, cannot connect, etc. -- there are sites that provide updates, reports and even constantly-updated outage maps (example: DownDetector.com).
The easiest and quickest thing to do is an internet search of something like "yahoo mail down" or "aol mail down" and you'll see all the choices.
Few things reveal your intellect and your generosity of spirit—the parallel powers of your heart and mind—better than how you give feedback.~Maria Popova