Old email aliases still working, receiving a ton of spam.

Hello all,

25+ year apple user. My ID is a mac.com ID. I may have asked this question a few months ago and posted a similar question to the community. Unfortunately, Apple is becoming increasingly frustrating, even with these discussion forums. It's impossible to find my old posts, as evidenced by the multitude of threads like these:

How do I find my own questions? - Apple Community

It would be refreshing to have access to all of my topics, as they're usually important with great solutions from the community. But the community is becoming more-and-more pointless if you can't even find your own questions after a short time.

On to today's topic of frustration... spam email arriving from long deleted email aliases. I have an alias that I only used about 15 years ago for a short time. I deleted it when it was no longer useful, like many other aliases I have used on iCloud throughout the years. Now, all of a sudden, I'm getting a MASSIVE amount of spam addressed to that old alias, which was deleted over 15 years ago.

That's not the only one... I get emails from other old aliases from time-to-time.

I can send email from my active default iCloud email address to the old aliases.

What's worse, the email 'blocking' feature is useless. When you block a sender, mail is supposed to direct anything from that sender directly to the trash, bypassing the junk bin all together. That has NEVER worked.

Can anyone tell me why aliases I've deleted are still functioning? How can I get Apple to 'fix' this issue? Or is this an exercise in endless frustration that will never have a solution, like much of how things with Apple tend to be functioning nowadays?

The ultimate solution may be to just close down my iCloud account, which I'd hate to do, outside of keeping my ID so my devices function. There's a ton of 'infrastructure' that surrounds my account, which I run my business through for communication needs (mail, calendars, etc.).